Reverse MX

GEThttps://api.deepinfo.com/v1/discovery/reverse-mx

Finds domains that use the mail server mx.

Example

Request

curl

curl 'https://api.deepinfo.com/v1/discovery/reverse-mx?mx=aspmx.l.google.com&page_size=25' \
  -H 'apikey: YOUR_API_KEY' \
  -H 'Accept: application/json'

Python

import requests

url = "https://api.deepinfo.com/v1/discovery/reverse-mx"

params = {
    "mx": "aspmx.l.google.com",
    "page_size": "25"
}

headers = {
    "apikey": "YOUR_API_KEY",
    "Accept": "application/json"
}

response = requests.get(url, params=params, headers=headers)
response.raise_for_status()
print(response.json())

JavaScript

const url = "https://api.deepinfo.com/v1/discovery/reverse-mx?mx=aspmx.l.google.com&page_size=25";

const response = await fetch(url, {
  method: "GET",
  headers: {
    "apikey": "YOUR_API_KEY",
    "Accept": "application/json"
  },
});

const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	req, err := http.NewRequest("GET", "https://api.deepinfo.com/v1/discovery/reverse-mx?mx=aspmx.l.google.com&page_size=25", nil)
	if err != nil {
		panic(err)
	}
	req.Header.Set("apikey", "YOUR_API_KEY")
	req.Header.Set("Accept", "application/json")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()

	body, err := io.ReadAll(res.Body)
	if err != nil {
		panic(err)
	}
	fmt.Println(string(body))
}

Java

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

public class Main {
    public static void main(String[] args) throws Exception {
        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create("https://api.deepinfo.com/v1/discovery/reverse-mx?mx=aspmx.l.google.com&page_size=25"))
            .header("apikey", "YOUR_API_KEY")
            .header("Accept", "application/json")
            .GET()
            .build();

        HttpResponse<String> response = HttpClient.newHttpClient()
            .send(request, HttpResponse.BodyHandlers.ofString());

        System.out.println(response.body());
    }
}

using System;
using System.Net.Http;

using var client = new HttpClient();

var request = new HttpRequestMessage(HttpMethod.Get, "https://api.deepinfo.com/v1/discovery/reverse-mx?mx=aspmx.l.google.com&page_size=25");
request.Headers.Add("apikey", "YOUR_API_KEY");
request.Headers.Add("Accept", "application/json");

using var response = await client.SendAsync(request);
Console.WriteLine(await response.Content.ReadAsStringAsync());

PHP

<?php

$curl = curl_init();

curl_setopt_array($curl, [
    CURLOPT_URL => 'https://api.deepinfo.com/v1/discovery/reverse-mx?mx=aspmx.l.google.com&page_size=25',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => [
        'apikey: YOUR_API_KEY',
        'Accept: application/json',
    ],
]);

$response = curl_exec($curl);

if ($response === false) {
    throw new RuntimeException(curl_error($curl));
}

echo $response . PHP_EOL;

Ruby

require 'net/http'
require 'uri'

uri = URI('https://api.deepinfo.com/v1/discovery/reverse-mx?mx=aspmx.l.google.com&page_size=25')

request = Net::HTTP::Get.new(uri)
request['apikey'] = 'YOUR_API_KEY'
request['Accept'] = 'application/json'

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: uri.scheme == 'https') do |http|
  http.request(request)
end

puts response.body

Response

200 OK · application/json

Response Body

{
  "page": 1,
  "page_size": 25,
  "result_count": 15627094,
  "results": [
    {
      "punycode": "eyesagetech.ca",
      "unicode": "eyesagetech.ca",
      "is_idn": false,
      "subdomain": null,
      "subdomain_last": null,
      "subdomain_root": null,
      "name": {
        "punycode": "eyesagetech",
        "unicode": "eyesagetech",
        "is_idn": false,
        "contains_letter": true,
        "contains_number": false,
        "contains_hyphen": false,
        "length": 11,
        "lang": "en",
        "keywords": [
          "eyes",
          "age"
        ],
        "keyword_count": 3,
        "latinized": [],
        "contains_confusable": false
      },
      "domain": {
        "punycode": "eyesagetech.ca",
        "unicode": "eyesagetech.ca",
        "is_idn": false,
        "name": {
          "punycode": "eyesagetech",
          "unicode": "eyesagetech",
          "is_idn": false,
          "contains_letter": true,
          "contains_number": false,
          "contains_hyphen": false,
          "length": 11,
          "lang": "en",
          "keywords": [
            "eyes",
            "age"
          ],
          "keyword_count": 3
        },
        "extension": {
          "punycode": "ca",
          "unicode": "ca",
          "is_idn": false
        },
        "extension_root": {
          "punycode": "ca",
          "unicode": "ca",
          "is_idn": false
        },
        "extension_sub": null,
        "extension_type": 2,
        "reserved": null,
        "premium": null,
        "registered": true,
        "whois": {
          "create_date": "2021-11-01T19:16:10Z",
          "update_date": "2025-11-02T14:18:16Z",
          "expiry_date": "2027-11-01T19:16:10Z",
          "registrar": "go daddy domains canada, inc",
          "registrant": {
            "name": null,
            "organization": null,
            "street": null,
            "city": null,
            "state": null,
            "postal_code": null,
            "country": null,
            "phone": null,
            "email": null
          },
          "name_servers": [
            "ns29.domaincontrol.com",
            "ns30.domaincontrol.com"
          ],
          "domain_status": [
            "clientdeleteprohibited",
            "clienttransferprohibited"
          ],
          "whois_server": "whois.ca.fury.ca",
          "check_date": "2026-09-18T14:48:30Z"
        },
        "whois_normalized": {
          "registrant": null
        },
        "whois_last_check_date": "2026-09-18T14:48:30Z",
        "whois_create_date_historical": [
          "2021-11-01T19:16:10Z"
        ],
        "whois_last_change_date": "2026-06-19T15:03:17Z",
        "whois_registrant_email_historical": [],
        "whois_privacy_enabled": null,
        "dns": {
          "a": {
            "update_date": "2026-09-13T09:48:37Z",
            "ip_addresses": [
              "198.49.23.144",
              "198.49.23.145"
            ]
          }
        },
        "dns_last_change_date": "2026-01-17T11:11:54Z",
        "ip_history": [
          "198.185.159.144",
          "198.185.159.145"
        ],
        "ssl": {
          "validity": {
            "start_date": "2026-07-05T22:08:15Z",
            "end_date": "2026-10-03T22:08:14Z"
          },
          "serial_number": "456191727422648415773941112181601225465726",
          "check_date": "2026-08-02T22:04:40Z"
        },
        "ssl_last_change_date": "2026-08-02T22:04:56Z"
      },
      "type": 1,
      "subdomain_level_count": 0,
      "dns": {
        "a": {
          "update_date": "2026-09-13T09:48:37Z",
          "ip_addresses": [
            "198.49.23.144",
            "198.49.23.145"
          ]
        },
        "aaaa": {
          "update_date": "2026-09-13T09:48:37Z",
          "ip_addresses": []
        },
        "ns": {
          "update_date": "2026-09-13T09:48:37Z",
          "name_servers": [
            "ns29.domaincontrol.com",
            "ns30.domaincontrol.com"
          ]
        },
        "mx": {
          "update_date": "2026-09-13T09:48:37Z",
          "mail_servers": [
            "aspmx.l.google.com"
          ]
        },
        "soa": {
          "update_date": "2026-09-13T09:48:37Z",
          "mnames": [
            "ns29.domaincontrol.com"
          ],
          "rnames": [
            "dns.domain-496.example"
          ],
          "rname_emails": [
            "user@domain-496.example"
          ]
        },
        "txt": {
          "update_date": "2026-09-13T09:48:37Z",
          "values": [
            "\"google-site-verification=12e3VJH86c8I-1pd4azEoITQk1l2RjpG7PdCAe41mxA\"",
            "\"google-site-verification=JjnQ8Jk5eX5mJNk9UcXgp9pPNxIQpO7NVFVOGLlZOFs\""
          ]
        },
        "cname": {
          "update_date": "2026-09-13T09:48:37Z",
          "values": []
        },
        "others": []
      },
      "dns_last_change_date": "2026-01-17T11:11:51Z",
      "ip_history": [
        "198.185.159.144",
        "198.185.159.145"
      ],
      "ssl": {
        "tags": [
          "dla"
        ],
        "fqdns": [
          "eyesagetech.ca"
        ],
        "version": 3,
        "serial_number": "456191727422648415773941112181601225465726",
        "fingerprint": {
          "sha256": "04e31b4a0a34e356df621948c537e7b660eabe9184d2024a27a509acf8be0725",
          "sha1": "4ed5a8fa25308114427508d4cc94e513bcee1709",
          "md5": "f3e9e0e085040386f861f96d0e8e0ad4"
        },
        "validity": {
          "start_date": "2026-07-05T22:08:15Z",
          "end_date": "2026-10-03T22:08:14Z",
          "length": 7775999
        },
        "signature": {
          "is_self_signed": false,
          "is_valid": true,
          "value": "1zasNJzMXXXiI41cthRuju9Vo4rAg9zeiPMlZJF+zHFAeFNt/QpNjTMEL1Zv1qACcQeIkq7Fd8pasBUCb4SUANlXjafwsU9rLfkCU+o4aK1GhmHZlD7l/p8uNz/wHaFakyxFeUSeIArfQzv58DjOqHOfPFTqrVmCfpT5FXZCoZt61D91i/WoahUKSr9+QN8hXsZ8Ja7filD092C6fQZUhS/6EJ/jVVbE7ScRGiT03S8kagsNFaBCVsz/buzYDHGZ7CWbTeoiDhHYgo19JFFKlwbVnMxsUVlTO3l0f8JuX9J314iAvJ6lcpHmQ3TrfCl882pD66EZ29q98IpktoPP7g==",
          "algorithm": {
            "oid": "1.2.840.113549.1.1.11",
            "name": "sha256"
          }
        },
        "issuer_dn": "CN=YR2,O=Let's Encrypt,C=US",
        "issuer": {
          "common_name": "YR2",
          "country": "US",
          "state": null,
          "locality": null,
          "organization": "Let's Encrypt",
          "organizational_unit": null
        },
        "subject_dn": "CN=eyesagetech.ca",
        "subject": {
          "common_name": "eyesagetech.ca",
          "country": null,
          "state": null,
          "locality": null,
          "organization": null,
          "organizational_unit": null
        },
        "extensions": {
          "authority_key_id": "QBUtJnntMiCe35pyHdYyH4EMgQw=",
          "basic_constraints": {
            "is_ca": false
          },
          "certificate_policies": [
            "2.23.140.1.2.1"
          ],
          "extended_key_usage": {
            "client_auth": null,
            "server_auth": true
          },
          "key_usage": {
            "digital_signature": true,
            "content_commitment": false,
            "key_agreement": false,
            "data_encipherment": false,
            "key_encipherment": true,
            "key_cert_sign": false,
            "crl_sign": false
          },
          "signed_certificate_timestamps": [
            "2026-07-05T23:06:45Z"
          ],
          "subject_alt_name": {
            "dns_names": [
              "eyesagetech.ca"
            ]
          },
          "subject_key_id": "Y9631Z5jIwozeoY5hz4QzDS0umw="
        },
        "check_date": "2026-08-02T22:04:40Z"
      },
      "ssl_last_change_date": "2026-08-02T22:04:56Z",
      "webdata": {
        "connection_status": "success",
        "html": {
          "source_code_hash": "a49547f2ab53320df6925c1c2d85bd25054886195569449016eb61ff287e84fc"
        },
        "http": {
          "status_code_first": 301,
          "status_code_last": 404,
          "redirection_history": [
            {
              "url": "http://eyesagetech.ca/",
              "status_code": 301
            },
            {
              "url": "https://www.eyesagetech.ca/",
              "status_code": 404
            }
          ],
          "external_redirection": false,
          "final_url": "https://www.eyesagetech.ca/",
          "final_fqdn": "www.eyesagetech.ca",
          "final_domain": "eyesagetech.ca",
          "headers": {
            "others": [
              {
                "name": "age",
                "value": "0"
              },
              {
                "name": "content_length",
                "value": "3312"
              }
            ],
            "access_control_allow_headers": null,
            "access_control_allow_methods": null,
            "access_control_allow_origin": null,
            "cache_control": null,
            "clear_site_data": null,
            "content_encoding": null,
            "content_security_policy": null,
            "content_type": "text/html;charset=utf-8",
            "cross_origin_embedder_policy": null,
            "cross_origin_opener_policy": null,
            "cross_origin_resource_policy": null,
            "expect_ct": null,
            "feature_policy": null,
            "last_modified": null,
            "permission_policy": null,
            "referrer_policy": null,
            "server": "Squarespace",
            "set_cookie": null,
            "strict_transport_security": "max-age=15552000",
            "x_content_type_options": "nosniff",
            "x_download_options": null,
            "x_frame_options": "SAMEORIGIN",
            "x_permitted_cross_domain_policies": null,
            "x_powered_by": null,
            "x_xss_protection": null
          },
          "cookies": []
        }
      }
    },
    {
      "punycode": "lehighvalleynorml.org",
      "unicode": "lehighvalleynorml.org",
      "is_idn": false,
      "subdomain": null,
      "subdomain_last": null,
      "subdomain_root": null,
      "name": {
        "punycode": "lehighvalleynorml",
        "unicode": "lehighvalleynorml",
        "is_idn": false,
        "contains_letter": true,
        "contains_number": false,
        "contains_hyphen": false,
        "length": 17,
        "lang": "en",
        "keywords": [
          "lehigh",
          "valley"
        ],
        "keyword_count": 3,
        "latinized": [],
        "contains_confusable": false
      },
      "domain": {
        "punycode": "lehighvalleynorml.org",
        "unicode": "lehighvalleynorml.org",
        "is_idn": false,
        "name": {
          "punycode": "lehighvalleynorml",
          "unicode": "lehighvalleynorml",
          "is_idn": false,
          "contains_letter": true,
          "contains_number": false,
          "contains_hyphen": false,
          "length": 17,
          "lang": "en",
          "keywords": [
            "lehigh",
            "valley"
          ],
          "keyword_count": 3
        },
        "extension": {
          "punycode": "org",
          "unicode": "org",
          "is_idn": false
        },
        "extension_root": {
          "punycode": "org",
          "unicode": "org",
          "is_idn": false
        },
        "extension_sub": null,
        "extension_type": 1,
        "reserved": null,
        "premium": null,
        "registered": true,
        "whois": {
          "create_date": "2014-12-09T01:12:04Z",
          "update_date": "2026-01-23T01:12:13Z",
          "expiry_date": "2026-12-09T01:12:04Z",
          "registrar": "godaddy.com, llc",
          "registrant": {
            "name": null,
            "organization": null,
            "street": null,
            "city": null,
            "state": null,
            "postal_code": null,
            "country": null,
            "phone": null,
            "email": null
          },
          "name_servers": [
            "ns35.domaincontrol.com",
            "ns36.domaincontrol.com"
          ],
          "domain_status": [
            "clientdeleteprohibited",
            "clientrenewprohibited"
          ],
          "whois_server": "http://whois.godaddy.com",
          "check_date": "2026-05-11T04:31:01Z"
        },
        "whois_normalized": {
          "registrant": null
        },
        "whois_last_check_date": "2026-05-11T04:31:01Z",
        "whois_create_date_historical": [
          "2014-12-09T01:12:04Z"
        ],
        "whois_last_change_date": "2026-02-04T20:15:15Z",
        "whois_registrant_email_historical": [
          "please query the rdds service of the registrar of record identified in this output for information on how to contact the registrant, admin, or tech contact of the queried domain name.",
          "redacted"
        ],
        "whois_privacy_enabled": null,
        "dns": {
          "a": {
            "update_date": "2026-09-18T14:51:58Z",
            "ip_addresses": [
              "13.248.243.5",
              "76.223.105.230"
            ]
          }
        },
        "dns_last_change_date": "2026-09-18T14:53:48Z",
        "ip_history": [
          "198.185.159.144",
          "198.185.159.145"
        ],
        "ssl": {
          "validity": {
            "start_date": "2026-03-10T02:36:18Z",
            "end_date": "2026-09-24T02:36:18Z"
          },
          "serial_number": "5553560761213865511",
          "check_date": "2026-04-21T22:06:34Z"
        },
        "ssl_last_change_date": "2026-04-18T03:07:01Z"
      },
      "type": 1,
      "subdomain_level_count": 0,
      "dns": {
        "a": {
          "update_date": "2026-09-18T14:51:58Z",
          "ip_addresses": [
            "13.248.243.5",
            "76.223.105.230"
          ]
        },
        "aaaa": {
          "update_date": "2026-09-18T14:51:58Z",
          "ip_addresses": []
        },
        "ns": {
          "update_date": "2026-09-18T14:51:58Z",
          "name_servers": [
            "ns35.domaincontrol.com",
            "ns36.domaincontrol.com"
          ]
        },
        "mx": {
          "update_date": "2026-09-18T14:51:58Z",
          "mail_servers": [
            "aspmx.l.google.com",
            "alt1.aspmx.l.google.com"
          ]
        },
        "soa": {
          "update_date": "2026-09-18T14:51:58Z",
          "mnames": [
            "ns35.domaincontrol.com"
          ],
          "rnames": [
            "dns.domain-496.example"
          ],
          "rname_emails": [
            "user@domain-496.example"
          ]
        },
        "txt": {
          "update_date": "2026-09-18T14:51:58Z",
          "values": []
        },
        "cname": {
          "update_date": "2026-09-18T14:51:58Z",
          "values": []
        },
        "others": []
      },
      "dns_last_change_date": "2026-09-18T14:53:46Z",
      "ip_history": [
        "198.185.159.144",
        "198.185.159.145"
      ],
      "ssl": {
        "tags": [
          "dla"
        ],
        "fqdns": [
          "lehighvalleynorml.org",
          "www.lehighvalleynorml.org"
        ],
        "version": 3,
        "serial_number": "5553560761213865511",
        "fingerprint": {
          "sha256": "c65dd89328f882737e60fa5f7db7a97ac70ef0d940374e6ac208ec67a9de4e83",
          "sha1": "86a544f7e04f4be875579704f7b2313c3c28bdfd",
          "md5": "7229a6a813a0a2d018ad2e18123cd860"
        },
        "validity": {
          "start_date": "2026-03-10T02:36:18Z",
          "end_date": "2026-09-24T02:36:18Z",
          "length": 17107200
        },
        "signature": {
          "is_self_signed": false,
          "is_valid": true,
          "value": "b/l0wpEgkZZIjJIBxHj/BS+YII2+9hwZG44iGgnHCPk1R/TSQWnREFe3PrPV1UfndiAqcwsYzyu10fAZkK8PR6/bjaNTjMEk3oMSV2pNjAMboNgFCDU0oFcjYjNCko+fgLtmzi282lt3Ft/+eQJ+DvZj4Zq9gSUDH2cxahYf8Xpc+LpM/4SkiBS0+OGcSy0z+OohF/zhRd/IgCQjZUPc0POUThsjIEHL1so7wOaYu2F1swDRPraDNivRMJwKnEHDaL5+TlZUyGStNSrOI2WljjM4DsKstB8+MF7hBjsOzGEXlUjyY6e0nOontMcpD0lwIZ5eRHPm4mop2qD1Rc7Gnw==",
          "algorithm": {
            "oid": "1.2.840.113549.1.1.11",
            "name": "sha256"
          }
        },
        "issuer_dn": "CN=Go Daddy Secure Certificate Authority - G2,OU=http://certs.godaddy.com/repository/,O=GoDaddy.com\\, Inc.,L=Scottsdale,ST=Arizona,C=US",
        "issuer": {
          "common_name": "Go Daddy Secure Certificate Authority - G2",
          "country": "US",
          "state": "Arizona",
          "locality": "Scottsdale",
          "organization": "GoDaddy.com, Inc.",
          "organizational_unit": "http://certs.godaddy.com/repository/"
        },
        "subject_dn": "CN=lehighvalleynorml.org",
        "subject": {
          "common_name": "lehighvalleynorml.org",
          "country": null,
          "state": null,
          "locality": null,
          "organization": null,
          "organizational_unit": null
        },
        "extensions": {
          "authority_key_id": "QMK9J47MNIMwojPX+2yz8LQsgM4=",
          "basic_constraints": {
            "is_ca": false
          },
          "certificate_policies": [
            "2.23.140.1.2.1",
            "2.16.840.1.114413.1.7.23.1"
          ],
          "extended_key_usage": {
            "client_auth": true,
            "server_auth": true
          },
          "key_usage": {
            "digital_signature": true,
            "content_commitment": false,
            "key_agreement": false,
            "data_encipherment": false,
            "key_encipherment": true,
            "key_cert_sign": false,
            "crl_sign": false
          },
          "signed_certificate_timestamps": [
            "2026-03-10T02:36:18Z",
            "2026-03-10T02:36:19Z"
          ],
          "subject_alt_name": {
            "dns_names": [
              "lehighvalleynorml.org",
              "www.lehighvalleynorml.org"
            ]
          },
          "subject_key_id": "aBB/j1Wx8myD07a9dXoZnMvJdCc="
        },
        "check_date": "2026-04-21T22:06:34Z"
      },
      "ssl_last_change_date": "2026-04-18T03:06:59Z",
      "webdata": {
        "connection_status": "success",
        "html": {
          "source_code_hash": "a36e4a6f313190e947a28359a848be8cfb08c51ab5e55eac6c2ab2c749fef35c"
        },
        "http": {
          "status_code_first": 308,
          "status_code_last": 200,
          "redirection_history": [
            {
              "url": "http://lehighvalleynorml.org/",
              "status_code": 308
            },
            {
              "url": "https://lehighvalleynorml.org/",
              "status_code": 200
            }
          ],
          "external_redirection": false,
          "final_url": "https://lehighvalleynorml.org/",
          "final_fqdn": "lehighvalleynorml.org",
          "final_domain": "lehighvalleynorml.org",
          "headers": {
            "others": [
              {
                "name": "vary",
                "value": "Accept-Encoding"
              },
              {
                "name": "link",
                "value": "<//img1.domain-2173.example/ceph-p3-01/website-builder-data-prod/static/widgets/UX.4.51.22.js>; rel=preload; as=script; crossorigin,<https://img1.domain-2173.example/gfonts/s/muli/v34/7Aulp_0qiz-aVz7u3PJLcUMYOFnOkEk30eg.woff2>; rel=preload; as=font; crossorigin,<https://img1.domain-2173.example/gfonts/s/quicksand/v37/6xKtdSZaM9iE8KbpRA_hK1QN.woff2>; rel=preload; as=font; crossorigin,<https://fonts.googleap…"
              }
            ],
            "access_control_allow_headers": null,
            "access_control_allow_methods": null,
            "access_control_allow_origin": null,
            "cache_control": "max-age=30",
            "clear_site_data": null,
            "content_encoding": "gzip",
            "content_security_policy": "frame-ancestors 'self' godaddy.com *.godaddy.com dev-godaddy.com *.dev-godaddy.com test-godaddy.com *.test-godaddy.com",
            "content_type": "text/html;charset=utf-8",
            "cross_origin_embedder_policy": null,
            "cross_origin_opener_policy": null,
            "cross_origin_resource_policy": null,
            "expect_ct": null,
            "feature_policy": null,
            "last_modified": null,
            "permission_policy": null,
            "referrer_policy": null,
            "server": "DPS/2.0.0-beta+sha-cb8eafb",
            "set_cookie": "dps_site_id=us-west-2; path=/; secure",
            "strict_transport_security": "max-age=63072000; includeSubDomains; preload",
            "x_content_type_options": null,
            "x_download_options": null,
            "x_frame_options": null,
            "x_permitted_cross_domain_policies": null,
            "x_powered_by": null,
            "x_xss_protection": null
          },
          "cookies": [
            {
              "name": "dps_site_id",
              "value": "us-west-2"
            }
          ]
        }
      }
    }
  ]
}

Content-Type: application/json
deepinfo-request-id: 5f0c6a8e-1b2d-4c3e-9f4a-7b8c9d0e1f2a

Request

curl

curl 'https://api.deepinfo.com/v1/discovery/reverse-mx?mx=aspmx.l.google.com&apex=notabool' \
  -H 'apikey: YOUR_API_KEY' \
  -H 'Accept: application/json'

Python

import requests

url = "https://api.deepinfo.com/v1/discovery/reverse-mx"

params = {
    "mx": "aspmx.l.google.com",
    "apex": "notabool"
}

headers = {
    "apikey": "YOUR_API_KEY",
    "Accept": "application/json"
}

response = requests.get(url, params=params, headers=headers)
response.raise_for_status()
print(response.json())

JavaScript

const url = "https://api.deepinfo.com/v1/discovery/reverse-mx?mx=aspmx.l.google.com&apex=notabool";

const response = await fetch(url, {
  method: "GET",
  headers: {
    "apikey": "YOUR_API_KEY",
    "Accept": "application/json"
  },
});

const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	req, err := http.NewRequest("GET", "https://api.deepinfo.com/v1/discovery/reverse-mx?mx=aspmx.l.google.com&apex=notabool", nil)
	if err != nil {
		panic(err)
	}
	req.Header.Set("apikey", "YOUR_API_KEY")
	req.Header.Set("Accept", "application/json")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()

	body, err := io.ReadAll(res.Body)
	if err != nil {
		panic(err)
	}
	fmt.Println(string(body))
}

Java

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

public class Main {
    public static void main(String[] args) throws Exception {
        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create("https://api.deepinfo.com/v1/discovery/reverse-mx?mx=aspmx.l.google.com&apex=notabool"))
            .header("apikey", "YOUR_API_KEY")
            .header("Accept", "application/json")
            .GET()
            .build();

        HttpResponse<String> response = HttpClient.newHttpClient()
            .send(request, HttpResponse.BodyHandlers.ofString());

        System.out.println(response.body());
    }
}

using System;
using System.Net.Http;

using var client = new HttpClient();

var request = new HttpRequestMessage(HttpMethod.Get, "https://api.deepinfo.com/v1/discovery/reverse-mx?mx=aspmx.l.google.com&apex=notabool");
request.Headers.Add("apikey", "YOUR_API_KEY");
request.Headers.Add("Accept", "application/json");

using var response = await client.SendAsync(request);
Console.WriteLine(await response.Content.ReadAsStringAsync());

PHP

<?php

$curl = curl_init();

curl_setopt_array($curl, [
    CURLOPT_URL => 'https://api.deepinfo.com/v1/discovery/reverse-mx?mx=aspmx.l.google.com&apex=notabool',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => [
        'apikey: YOUR_API_KEY',
        'Accept: application/json',
    ],
]);

$response = curl_exec($curl);

if ($response === false) {
    throw new RuntimeException(curl_error($curl));
}

echo $response . PHP_EOL;

Ruby

require 'net/http'
require 'uri'

uri = URI('https://api.deepinfo.com/v1/discovery/reverse-mx?mx=aspmx.l.google.com&apex=notabool')

request = Net::HTTP::Get.new(uri)
request['apikey'] = 'YOUR_API_KEY'
request['Accept'] = 'application/json'

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: uri.scheme == 'https') do |http|
  http.request(request)
end

puts response.body

Response

400 Bad Request · application/json

Response Body

{
  "code": 10400,
  "parameters": [
    {
      "param": "apex",
      "details": [
        "Must be a valid boolean."
      ]
    }
  ],
  "solution": "https://docs.deepinfo.com/reference/"
}

Content-Type: application/json
deepinfo-request-id: 5f0c6a8e-1b2d-4c3e-9f4a-7b8c9d0e1f2a

Authentication

Send your API key in the apikey request header.

Query Parameters

Parameter	Required	Description
`mx`	Required	Example`aspmx.l.google.com`
`page_size`	Optional	Min `25`, max `100`. Default `100`. Example`25`
`ordering`	Optional
`export`	Optional	Default `false`.
`export_format`	Optional	One of: `json`, `csv`.
`export_scope`	Optional	One of: `basic`, `default`, `extended`.
`apex`	Optional	Default `false`.
`include_subdomains`	Optional	Default `false`.
`page`	Optional	Min `1`, max `400`. Default `1`. Example`1`

Response Fields

Field	Type	Description
`page`	integer
`page_size`	integer
`result_count`	integer
`results`	array of object
`results[].punycode`	string
`results[].unicode`	string
`results[].is_idn`	boolean
`results[].subdomain`	object
`results[].subdomain_last`	object
`results[].subdomain_root`	object
`results[].name`	object
`results[].domain`	object
`results[].type`	integer
`results[].subdomain_level_count`	integer
`results[].dns`	object
`results[].dns_last_change_date`	string	date-time
`results[].ip_history`	array of string
`results[].ssl`	object
`results[].ssl_last_change_date`	string	date-time
`results[].webdata`	object

Paginated. See Getting Started → Pagination.

Response Schema

Inferred from examples Built from the saved 2xx example response: the fields it contains, with the types seen there. It is not a contract.

Field	Type	Example
`page`	number	`1`
`page_size`	number	`25`
`result_count`	number	`15627094`
`results`	array<object>
`results[].punycode`	string	`"eyesagetech.ca"`
`results[].unicode`	string	`"eyesagetech.ca"`
`results[].is_idn`	boolean	`false`
`results[].subdomain`	null
`results[].subdomain_last`	null
`results[].subdomain_root`	null
`results[].name`	object
`results[].name.punycode`	string	`"eyesagetech"`
`results[].name.unicode`	string	`"eyesagetech"`
`results[].name.is_idn`	boolean	`false`
`results[].name.contains_letter`	boolean	`true`
`results[].name.contains_number`	boolean	`false`
`results[].name.contains_hyphen`	boolean	`false`
`results[].name.length`	number	`11`
`results[].name.lang`	string	`"en"`
`results[].name.keywords`	array<string>	`"eyes"`
`results[].name.keyword_count`	number	`3`
`results[].name.latinized`	array
`results[].name.contains_confusable`	boolean	`false`
`results[].domain`	object
`results[].domain.punycode`	string	`"eyesagetech.ca"`
`results[].domain.unicode`	string	`"eyesagetech.ca"`
`results[].domain.is_idn`	boolean	`false`
`results[].domain.name`	object
`results[].domain.name.punycode`	string	`"eyesagetech"`
`results[].domain.name.unicode`	string	`"eyesagetech"`
`results[].domain.name.is_idn`	boolean	`false`
`results[].domain.name.contains_letter`	boolean	`true`
`results[].domain.name.contains_number`	boolean	`false`
`results[].domain.name.contains_hyphen`	boolean	`false`
`results[].domain.name.length`	number	`11`
`results[].domain.name.lang`	string	`"en"`
`results[].domain.name.keywords`	array<string>	`"eyes"`
`results[].domain.name.keyword_count`	number	`3`
`results[].domain.extension`	object
`results[].domain.extension.punycode`	string	`"ca"`
`results[].domain.extension.unicode`	string	`"ca"`
`results[].domain.extension.is_idn`	boolean	`false`
`results[].domain.extension_root`	object
`results[].domain.extension_root.punycode`	string	`"ca"`
`results[].domain.extension_root.unicode`	string	`"ca"`
`results[].domain.extension_root.is_idn`	boolean	`false`
`results[].domain.extension_sub`	null
`results[].domain.extension_type`	number	`2`
`results[].domain.reserved`	null
`results[].domain.premium`	null
`results[].domain.registered`	boolean	`true`
`results[].domain.whois`	object
`results[].domain.whois.create_date`	string	`"2021-11-01T19:16:10Z"`
`results[].domain.whois.update_date`	string	`"2025-11-02T14:18:16Z"`
`results[].domain.whois.expiry_date`	string	`"2027-11-01T19:16:10Z"`
`results[].domain.whois.registrar`	string	`"go daddy domains canada, inc"`
`results[].domain.whois.registrant`	object
`results[].domain.whois.registrant.name`	null
`results[].domain.whois.registrant.organization`	null
`results[].domain.whois.registrant.street`	null
`results[].domain.whois.registrant.city`	null
`results[].domain.whois.registrant.state`	null
`results[].domain.whois.registrant.postal_code`	null
`results[].domain.whois.registrant.country`	null
`results[].domain.whois.registrant.phone`	null
`results[].domain.whois.registrant.email`	null
`results[].domain.whois.name_servers`	array<string>	`"ns29.domaincontrol.com"`
`results[].domain.whois.domain_status`	array<string>	`"clientdeleteprohibited"`
`results[].domain.whois.whois_server`	string	`"whois.ca.fury.ca"`
`results[].domain.whois.check_date`	string	`"2026-09-18T14:48:30Z"`
`results[].domain.whois_normalized`	object
`results[].domain.whois_normalized.registrant`	null
`results[].domain.whois_last_check_date`	string	`"2026-09-18T14:48:30Z"`
`results[].domain.whois_create_date_historical`	array<string>	`"2021-11-01T19:16:10Z"`
`results[].domain.whois_last_change_date`	string	`"2026-06-19T15:03:17Z"`
`results[].domain.whois_registrant_email_historical`	array<string>
`results[].domain.whois_privacy_enabled`	null
`results[].domain.dns`	object
`results[].domain.dns.a`	object
`results[].domain.dns.a.update_date`	string	`"2026-09-13T09:48:37Z"`
`results[].domain.dns.a.ip_addresses`	array<string>	`"198.49.23.144"`
`results[].domain.dns_last_change_date`	string	`"2026-01-17T11:11:54Z"`
`results[].domain.ip_history`	array<string>	`"198.185.159.144"`
`results[].domain.ssl`	object
`results[].domain.ssl.validity`	object
`results[].domain.ssl.validity.start_date`	string	`"2026-07-05T22:08:15Z"`
`results[].domain.ssl.validity.end_date`	string	`"2026-10-03T22:08:14Z"`
`results[].domain.ssl.serial_number`	string	`"45619172742264841577394111218160122…"`
`results[].domain.ssl.check_date`	string	`"2026-08-02T22:04:40Z"`
`results[].domain.ssl_last_change_date`	string	`"2026-08-02T22:04:56Z"`
`results[].type`	number	`1`
`results[].subdomain_level_count`	number	`0`
`results[].dns`	object
`results[].dns.a`	object
`results[].dns.a.update_date`	string	`"2026-09-13T09:48:37Z"`
`results[].dns.a.ip_addresses`	array<string>	`"198.49.23.144"`
`results[].dns.aaaa`	object
`results[].dns.aaaa.update_date`	string	`"2026-09-13T09:48:37Z"`
`results[].dns.aaaa.ip_addresses`	array
`results[].dns.ns`	object
`results[].dns.ns.update_date`	string	`"2026-09-13T09:48:37Z"`
`results[].dns.ns.name_servers`	array<string>	`"ns29.domaincontrol.com"`
`results[].dns.mx`	object
`results[].dns.mx.update_date`	string	`"2026-09-13T09:48:37Z"`
`results[].dns.mx.mail_servers`	array<string>	`"aspmx.l.google.com"`
`results[].dns.soa`	object
`results[].dns.soa.update_date`	string	`"2026-09-13T09:48:37Z"`
`results[].dns.soa.mnames`	array<string>	`"ns29.domaincontrol.com"`
`results[].dns.soa.rnames`	array<string>	`"dns.domain-496.example"`
`results[].dns.soa.rname_emails`	array<string>
`results[].dns.txt`	object
`results[].dns.txt.update_date`	string	`"2026-09-13T09:48:37Z"`
`results[].dns.txt.values`	array<string>	`"\"google-site-verification=12e3VJH86…"`
`results[].dns.cname`	object
`results[].dns.cname.update_date`	string	`"2026-09-13T09:48:37Z"`
`results[].dns.cname.values`	array
`results[].dns.others`	array
`results[].dns_last_change_date`	string	`"2026-01-17T11:11:51Z"`
`results[].ip_history`	array<string>	`"198.185.159.144"`
`results[].ssl`	object
`results[].ssl.tags`	array<string>	`"dla"`
`results[].ssl.fqdns`	array<string>	`"eyesagetech.ca"`
`results[].ssl.version`	number	`3`
`results[].ssl.serial_number`	string	`"45619172742264841577394111218160122…"`
`results[].ssl.fingerprint`	object
`results[].ssl.fingerprint.sha256`	string	`"04e31b4a0a34e356df621948c537e7b660e…"`
`results[].ssl.fingerprint.sha1`	string	`"4ed5a8fa25308114427508d4cc94e513bce…"`
`results[].ssl.fingerprint.md5`	string	`"f3e9e0e085040386f861f96d0e8e0ad4"`
`results[].ssl.validity`	object
`results[].ssl.validity.start_date`	string	`"2026-07-05T22:08:15Z"`
`results[].ssl.validity.end_date`	string	`"2026-10-03T22:08:14Z"`
`results[].ssl.validity.length`	number	`7775999`
`results[].ssl.signature`	object
`results[].ssl.signature.is_self_signed`	boolean	`false`
`results[].ssl.signature.is_valid`	boolean	`true`
`results[].ssl.signature.value`	string	`"1zasNJzMXXXiI41cthRuju9Vo4rAg9zeiPM…"`
`results[].ssl.signature.algorithm`	object
`results[].ssl.signature.algorithm.oid`	string	`"1.2.840.113549.1.1.11"`
`results[].ssl.signature.algorithm.name`	string	`"sha256"`
`results[].ssl.issuer_dn`	string	`"CN=YR2,O=Let's Encrypt,C=US"`
`results[].ssl.issuer`	object
`results[].ssl.issuer.common_name`	string	`"YR2"`
`results[].ssl.issuer.country`	string	`"US"`
`results[].ssl.issuer.state`	string \| null	`"Arizona"`
`results[].ssl.issuer.locality`	string \| null	`"Scottsdale"`
`results[].ssl.issuer.organization`	string	`"Let's Encrypt"`
`results[].ssl.issuer.organizational_unit`	string \| null	`"http://certs.godaddy.com/repository/"`
`results[].ssl.subject_dn`	string	`"CN=eyesagetech.ca"`
`results[].ssl.subject`	object
`results[].ssl.subject.common_name`	string	`"eyesagetech.ca"`
`results[].ssl.subject.country`	null
`results[].ssl.subject.state`	null
`results[].ssl.subject.locality`	null
`results[].ssl.subject.organization`	null
`results[].ssl.subject.organizational_unit`	null
`results[].ssl.extensions`	object
`results[].ssl.extensions.authority_key_id`	string	`"QBUtJnntMiCe35pyHdYyH4EMgQw="`
`results[].ssl.extensions.basic_constraints`	object
`results[].ssl.extensions.basic_constraints.is_ca`	boolean	`false`
`results[].ssl.extensions.certificate_policies`	array<string>	`"2.23.140.1.2.1"`
`results[].ssl.extensions.extended_key_usage`	object
`results[].ssl.extensions.extended_key_usage.client_auth`	boolean \| null	`true`
`results[].ssl.extensions.extended_key_usage.server_auth`	boolean	`true`
`results[].ssl.extensions.key_usage`	object
`results[].ssl.extensions.key_usage.digital_signature`	boolean	`true`
`results[].ssl.extensions.key_usage.content_commitment`	boolean	`false`
`results[].ssl.extensions.key_usage.key_agreement`	boolean	`false`
`results[].ssl.extensions.key_usage.data_encipherment`	boolean	`false`
`results[].ssl.extensions.key_usage.key_encipherment`	boolean	`true`
`results[].ssl.extensions.key_usage.key_cert_sign`	boolean	`false`
`results[].ssl.extensions.key_usage.crl_sign`	boolean	`false`
`results[].ssl.extensions.signed_certificate_timestamps`	array<string>	`"2026-07-05T23:06:45Z"`
`results[].ssl.extensions.subject_alt_name`	object
`results[].ssl.extensions.subject_alt_name.dns_names`	array<string>	`"eyesagetech.ca"`
`results[].ssl.extensions.subject_key_id`	string	`"Y9631Z5jIwozeoY5hz4QzDS0umw="`
`results[].ssl.check_date`	string	`"2026-08-02T22:04:40Z"`
`results[].ssl_last_change_date`	string	`"2026-08-02T22:04:56Z"`
`results[].webdata`	object
`results[].webdata.connection_status`	string	`"success"`
`results[].webdata.html`	object
`results[].webdata.html.source_code_hash`	string	`"a49547f2ab53320df6925c1c2d85bd25054…"`
`results[].webdata.http`	object
`results[].webdata.http.status_code_first`	number	`301`
`results[].webdata.http.status_code_last`	number	`404`
`results[].webdata.http.redirection_history`	array<object>
`results[].webdata.http.redirection_history[].url`	string	`"http://eyesagetech.ca/"`
`results[].webdata.http.redirection_history[].status_code`	number	`301`
`results[].webdata.http.external_redirection`	boolean	`false`
`results[].webdata.http.final_url`	string	`"https://www.eyesagetech.ca/"`
`results[].webdata.http.final_fqdn`	string	`"www.eyesagetech.ca"`
`results[].webdata.http.final_domain`	string	`"eyesagetech.ca"`
`results[].webdata.http.headers`	object
`results[].webdata.http.headers.others`	array<object>
`results[].webdata.http.headers.others[].name`	string	`"age"`
`results[].webdata.http.headers.others[].value`	string	`"0"`
`results[].webdata.http.headers.access_control_allow_headers`	null
`results[].webdata.http.headers.access_control_allow_methods`	null
`results[].webdata.http.headers.access_control_allow_origin`	null
`results[].webdata.http.headers.cache_control`	string \| null	`"max-age=30"`
`results[].webdata.http.headers.clear_site_data`	null
`results[].webdata.http.headers.content_encoding`	string \| null	`"gzip"`
`results[].webdata.http.headers.content_security_policy`	string \| null	`"frame-ancestors 'self' godaddy.com…"`
`results[].webdata.http.headers.content_type`	string	`"text/html;charset=utf-8"`
`results[].webdata.http.headers.cross_origin_embedder_policy`	null
`results[].webdata.http.headers.cross_origin_opener_policy`	null
`results[].webdata.http.headers.cross_origin_resource_policy`	null
`results[].webdata.http.headers.expect_ct`	null
`results[].webdata.http.headers.feature_policy`	null
`results[].webdata.http.headers.last_modified`	null
`results[].webdata.http.headers.permission_policy`	null
`results[].webdata.http.headers.referrer_policy`	null
`results[].webdata.http.headers.server`	string	`"Squarespace"`
`results[].webdata.http.headers.set_cookie`	string \| null
`results[].webdata.http.headers.strict_transport_security`	string	`"max-age=15552000"`
`results[].webdata.http.headers.x_content_type_options`	string \| null	`"nosniff"`
`results[].webdata.http.headers.x_download_options`	null
`results[].webdata.http.headers.x_frame_options`	string \| null	`"SAMEORIGIN"`
`results[].webdata.http.headers.x_permitted_cross_domain_policies`	null
`results[].webdata.http.headers.x_powered_by`	null
`results[].webdata.http.headers.x_xss_protection`	null
`results[].webdata.http.cookies`	array<object>
`results[].webdata.http.cookies[].name`	string	`"dps_site_id"`
`results[].webdata.http.cookies[].value`	string	`"us-west-2"`

Examples

Saved examples from the Deepinfo API. Selecting one loads it into the request and response panels.

Worked Examples

Worked examples of this endpoint, each on its own page with the exact request and the response it returns.

Domains Using One Mail ServerThe domains whose MX record names aspmx.l.google.com, the Google Workspace mail server: 15,623,703 on the day of capture.
Any Mail Server Under the Same DomainWith apex=true, any mail server under google.com matches, not only aspmx.l.google.com: 22,508,485 domains instead of 15,623,703.
Earliest Expiry FirstThe domains on Cloudflare Email Routing, the earliest WHOIS expiry date first (ordering=domain.whois.expiry_date).

See all examples

Reference updated September 27, 2026