# Reverse NS

GET /discovery/reverse-ns: Finds domains that use the name server ns.

Source: https://docs.deepinfo.com/reference/discovery/reverse-ns/

Last updated: 2026-09-27

---
`GET https://api.deepinfo.com/v1/discovery/reverse-ns`

Finds domains that use the name server `ns`.

## Authentication

Send your API key in the `apikey` request header.

## Query Parameters

| Parameter | Required | Description | Example |
|---|---|---|---|
| `ns` | Required |  | `may.ns.cloudflare.com` |
| `page_size` | Optional | Min `25`, max `100`. Default `100`. | `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`. | `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](/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 |
|---|---|
| `page` | number |
| `page_size` | number |
| `result_count` | number |
| `results` | array<object> |
| `results[].punycode` | string |
| `results[].unicode` | string |
| `results[].is_idn` | boolean |
| `results[].subdomain` | null |
| `results[].subdomain_last` | null |
| `results[].subdomain_root` | null |
| `results[].name` | object |
| `results[].name.punycode` | string |
| `results[].name.unicode` | string |
| `results[].name.is_idn` | boolean |
| `results[].name.contains_letter` | boolean |
| `results[].name.contains_number` | boolean |
| `results[].name.contains_hyphen` | boolean |
| `results[].name.length` | number |
| `results[].name.lang` | string |
| `results[].name.keywords` | array<string> |
| `results[].name.keyword_count` | number |
| `results[].name.latinized` | array |
| `results[].name.contains_confusable` | boolean |
| `results[].domain` | object |
| `results[].domain.punycode` | string |
| `results[].domain.unicode` | string |
| `results[].domain.is_idn` | boolean |
| `results[].domain.name` | object |
| `results[].domain.name.punycode` | string |
| `results[].domain.name.unicode` | string |
| `results[].domain.name.is_idn` | boolean |
| `results[].domain.name.contains_letter` | boolean |
| `results[].domain.name.contains_number` | boolean |
| `results[].domain.name.contains_hyphen` | boolean |
| `results[].domain.name.length` | number |
| `results[].domain.name.lang` | string |
| `results[].domain.name.keywords` | array<string> |
| `results[].domain.name.keyword_count` | number |
| `results[].domain.extension` | object |
| `results[].domain.extension.punycode` | string |
| `results[].domain.extension.unicode` | string |
| `results[].domain.extension.is_idn` | boolean |
| `results[].domain.extension_root` | object |
| `results[].domain.extension_root.punycode` | string |
| `results[].domain.extension_root.unicode` | string |
| `results[].domain.extension_root.is_idn` | boolean |
| `results[].domain.extension_sub` | object \| null |
| `results[].domain.extension_sub.punycode` | string |
| `results[].domain.extension_sub.unicode` | string |
| `results[].domain.extension_sub.is_idn` | boolean |
| `results[].domain.extension_type` | number |
| `results[].domain.reserved` | null |
| `results[].domain.premium` | null |
| `results[].domain.registered` | boolean \| null |
| `results[].domain.whois` | object \| null |
| `results[].domain.whois.create_date` | string |
| `results[].domain.whois.update_date` | string |
| `results[].domain.whois.expiry_date` | string |
| `results[].domain.whois.registrar` | string |
| `results[].domain.whois.registrant` | object |
| `results[].domain.whois.registrant.name` | string |
| `results[].domain.whois.registrant.organization` | string |
| `results[].domain.whois.registrant.street` | string |
| `results[].domain.whois.registrant.city` | string |
| `results[].domain.whois.registrant.state` | string |
| `results[].domain.whois.registrant.postal_code` | string |
| `results[].domain.whois.registrant.country` | string |
| `results[].domain.whois.registrant.phone` | string |
| `results[].domain.whois.registrant.email` | string |
| `results[].domain.whois.name_servers` | array<string> |
| `results[].domain.whois.domain_status` | array<string> |
| `results[].domain.whois.whois_server` | string |
| `results[].domain.whois.check_date` | string |
| `results[].domain.whois_normalized` | object \| null |
| `results[].domain.whois_normalized.registrant` | object |
| `results[].domain.whois_normalized.registrant.organization` | string |
| `results[].domain.whois_normalized.registrant.phone` | string |
| `results[].domain.whois_normalized.registrant.email` | string |
| `results[].domain.whois_normalized.registrant.email_fqdn_apex` | string |
| `results[].domain.whois_normalized.registrant.email_domain_apex` | string |
| `results[].domain.whois_last_check_date` | string \| null |
| `results[].domain.whois_create_date_historical` | array<string> |
| `results[].domain.whois_last_change_date` | string \| null |
| `results[].domain.whois_registrant_email_historical` | array<string> |
| `results[].domain.whois_privacy_enabled` | boolean \| null |
| `results[].domain.dns` | object |
| `results[].domain.dns.a` | object |
| `results[].domain.dns.a.update_date` | string |
| `results[].domain.dns.a.ip_addresses` | array<string> |
| `results[].domain.dns_last_change_date` | string |
| `results[].domain.ip_history` | array<string> |
| `results[].domain.ssl` | object \| null |
| `results[].domain.ssl.validity` | object |
| `results[].domain.ssl.validity.start_date` | string |
| `results[].domain.ssl.validity.end_date` | string |
| `results[].domain.ssl.serial_number` | string |
| `results[].domain.ssl.check_date` | string |
| `results[].domain.ssl_last_change_date` | string |
| `results[].type` | number |
| `results[].subdomain_level_count` | number |
| `results[].dns` | object |
| `results[].dns.a` | object |
| `results[].dns.a.update_date` | string |
| `results[].dns.a.ip_addresses` | array<string> |
| `results[].dns.aaaa` | object |
| `results[].dns.aaaa.update_date` | string |
| `results[].dns.aaaa.ip_addresses` | array<string> |
| `results[].dns.ns` | object |
| `results[].dns.ns.update_date` | string |
| `results[].dns.ns.name_servers` | array<string> |
| `results[].dns.mx` | object |
| `results[].dns.mx.update_date` | string |
| `results[].dns.mx.mail_servers` | array<string> |
| `results[].dns.soa` | object |
| `results[].dns.soa.update_date` | string |
| `results[].dns.soa.mnames` | array<string> |
| `results[].dns.soa.rnames` | array<string> |
| `results[].dns.soa.rname_emails` | array<string> |
| `results[].dns.txt` | object |
| `results[].dns.txt.update_date` | string |
| `results[].dns.txt.values` | array<string> |
| `results[].dns.cname` | object |
| `results[].dns.cname.update_date` | string |
| `results[].dns.cname.values` | array |
| `results[].dns.others` | array |
| `results[].dns_last_change_date` | string |
| `results[].ip_history` | array<string> |
| `results[].ssl` | object \| null |
| `results[].ssl.tags` | array<string> |
| `results[].ssl.fqdns` | array<string> |
| `results[].ssl.version` | number |
| `results[].ssl.serial_number` | string |
| `results[].ssl.fingerprint` | object |
| `results[].ssl.fingerprint.sha256` | string |
| `results[].ssl.fingerprint.sha1` | string |
| `results[].ssl.fingerprint.md5` | string |
| `results[].ssl.validity` | object |
| `results[].ssl.validity.start_date` | string |
| `results[].ssl.validity.end_date` | string |
| `results[].ssl.validity.length` | number |
| `results[].ssl.signature` | object |
| `results[].ssl.signature.is_self_signed` | boolean |
| `results[].ssl.signature.is_valid` | boolean |
| `results[].ssl.signature.value` | string |
| `results[].ssl.signature.algorithm` | object |
| `results[].ssl.signature.algorithm.oid` | string |
| `results[].ssl.signature.algorithm.name` | string |
| `results[].ssl.issuer_dn` | string |
| `results[].ssl.issuer` | object |
| `results[].ssl.issuer.common_name` | string |
| `results[].ssl.issuer.country` | string |
| `results[].ssl.issuer.state` | null |
| `results[].ssl.issuer.locality` | null |
| `results[].ssl.issuer.organization` | string |
| `results[].ssl.issuer.organizational_unit` | null |
| `results[].ssl.subject_dn` | string |
| `results[].ssl.subject` | object |
| `results[].ssl.subject.common_name` | string |
| `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 |
| `results[].ssl.extensions.basic_constraints` | object |
| `results[].ssl.extensions.basic_constraints.is_ca` | boolean |
| `results[].ssl.extensions.certificate_policies` | array<string> |
| `results[].ssl.extensions.extended_key_usage` | object |
| `results[].ssl.extensions.extended_key_usage.client_auth` | null |
| `results[].ssl.extensions.extended_key_usage.server_auth` | boolean |
| `results[].ssl.extensions.key_usage` | object |
| `results[].ssl.extensions.key_usage.digital_signature` | boolean |
| `results[].ssl.extensions.key_usage.content_commitment` | boolean |
| `results[].ssl.extensions.key_usage.key_agreement` | boolean |
| `results[].ssl.extensions.key_usage.data_encipherment` | boolean |
| `results[].ssl.extensions.key_usage.key_encipherment` | boolean |
| `results[].ssl.extensions.key_usage.key_cert_sign` | boolean |
| `results[].ssl.extensions.key_usage.crl_sign` | boolean |
| `results[].ssl.extensions.signed_certificate_timestamps` | array<string> |
| `results[].ssl.extensions.subject_alt_name` | object |
| `results[].ssl.extensions.subject_alt_name.dns_names` | array<string> |
| `results[].ssl.extensions.subject_key_id` | string |
| `results[].ssl.check_date` | string |
| `results[].ssl_last_change_date` | string |
| `results[].webdata` | object |
| `results[].webdata.connection_status` | string |
| `results[].webdata.html` | object |
| `results[].webdata.html.source_code_hash` | string |
| `results[].webdata.http` | object |
| `results[].webdata.http.status_code_first` | number |
| `results[].webdata.http.status_code_last` | number |
| `results[].webdata.http.redirection_history` | array<object> |
| `results[].webdata.http.redirection_history[].url` | string |
| `results[].webdata.http.redirection_history[].status_code` | number |
| `results[].webdata.http.external_redirection` | boolean |
| `results[].webdata.http.final_url` | string |
| `results[].webdata.http.final_fqdn` | string |
| `results[].webdata.http.final_domain` | string |
| `results[].webdata.http.headers` | object |
| `results[].webdata.http.headers.others` | array<object> |
| `results[].webdata.http.headers.others[].name` | string |
| `results[].webdata.http.headers.others[].value` | string |
| `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` | null |
| `results[].webdata.http.headers.clear_site_data` | null |
| `results[].webdata.http.headers.content_encoding` | string |
| `results[].webdata.http.headers.content_security_policy` | null |
| `results[].webdata.http.headers.content_type` | string |
| `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 |
| `results[].webdata.http.headers.set_cookie` | null |
| `results[].webdata.http.headers.strict_transport_security` | null |
| `results[].webdata.http.headers.x_content_type_options` | null |
| `results[].webdata.http.headers.x_download_options` | null |
| `results[].webdata.http.headers.x_frame_options` | null |
| `results[].webdata.http.headers.x_permitted_cross_domain_policies` | null |
| `results[].webdata.http.headers.x_powered_by` | string \| null |
| `results[].webdata.http.headers.x_xss_protection` | null |
| `results[].webdata.http.cookies` | array |

## Examples

### 200 · OK

```bash
curl 'https://api.deepinfo.com/v1/discovery/reverse-ns?ns=may.ns.cloudflare.com&page_size=25' \
  -H 'apikey: YOUR_API_KEY' \
  -H 'Accept: application/json'
```

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

```json
{
  "page": 1,
  "page_size": 25,
  "result_count": 124059,
  "results": [
    {
      "punycode": "camckbusiness.com",
      "unicode": "camckbusiness.com",
      "is_idn": false,
      "subdomain": null,
      "subdomain_last": null,
      "subdomain_root": null,
      "name": {
        "punycode": "camckbusiness",
        "unicode": "camckbusiness",
        "is_idn": false,
        "contains_letter": true,
        "contains_number": false,
        "contains_hyphen": false,
        "length": 13,
        "lang": "en",
        "keywords": [
          "cam",
          "ck"
        ],
        "keyword_count": 3,
        "latinized": [],
        "contains_confusable": false
      },
      "domain": {
        "punycode": "camckbusiness.com",
        "unicode": "camckbusiness.com",
        "is_idn": false,
        "name": {
          "punycode": "camckbusiness",
          "unicode": "camckbusiness",
          "is_idn": false,
          "contains_letter": true,
          "contains_number": false,
          "contains_hyphen": false,
          "length": 13,
          "lang": "en",
          "keywords": [
            "cam",
            "ck"
          ],
          "keyword_count": 3
        },
        "extension": {
          "punycode": "com",
          "unicode": "com",
          "is_idn": false
        },
        "extension_root": {
          "punycode": "com",
          "unicode": "com",
          "is_idn": false
        },
        "extension_sub": null,
        "extension_type": 1,
        "reserved": null,
        "premium": null,
        "registered": true,
        "whois": {
          "create_date": "2024-01-03T06:09:00Z",
          "update_date": "2026-05-06T01:18:20Z",
          "expiry_date": "2027-01-03T06:09:00Z",
          "registrar": "pdr ltd. d/b/a publicdomainregistry.com",
          "registrant": {
            "name": "REDACTED FOR PRIVACY",
            "organization": "redacted for privacy",
            "street": "REDACTED FOR PRIVACY",
            "city": "siem reap",
            "state": "siem reab",
            "postal_code": "REDACTED FOR PRIVACY",
            "country": "kh",
            "phone": "+1-555-0100",
            "email": "REDACTED FOR PRIVACY"
          },
          "name_servers": [
            "brad.ns.cloudflare.com",
            "may.ns.cloudflare.com"
          ],
          "domain_status": [
            "clienttransferprohibited"
          ],
          "whois_server": "whois.publicdomainregistry.com",
          "check_date": "2026-08-23T00:41:58Z"
        },
        "whois_normalized": {
          "registrant": {
            "organization": "redactedforprivacy",
            "phone": "+1-555-0100",
            "email": "REDACTED FOR PRIVACY",
            "email_fqdn_apex": "REDACTED FOR PRIVACY",
            "email_domain_apex": "REDACTED FOR PRIVACY"
          }
        },
        "whois_last_check_date": "2026-08-23T00:41:58Z",
        "whois_create_date_historical": [
          "2024-01-03T06:09:00Z"
        ],
        "whois_last_change_date": "2026-06-23T10:52:33Z",
        "whois_registrant_email_historical": [
          "user@it-smart.biz"
        ],
        "whois_privacy_enabled": false,
        "dns": {
          "a": {
            "update_date": "2026-09-10T21:31:14Z",
            "ip_addresses": [
              "104.21.90.116",
              "172.67.200.101"
            ]
          }
        },
        "dns_last_change_date": "2026-09-10T22:09:20Z",
        "ip_history": [
          "162.213.210.146",
          "154.26.128.114"
        ],
        "ssl": null,
        "ssl_last_change_date": "2024-09-29T21:48:48Z"
      },
      "type": 1,
      "subdomain_level_count": 0,
      "dns": {
        "a": {
          "update_date": "2026-09-10T21:31:14Z",
          "ip_addresses": [
            "104.21.90.116",
            "172.67.200.101"
          ]
        },
        "aaaa": {
          "update_date": "2026-09-10T21:31:14Z",
          "ip_addresses": [
            "2606:4700:3030::6815:5a74",
            "2606:4700:3032::ac43:c865"
          ]
        },
        "ns": {
          "update_date": "2026-09-10T21:31:14Z",
          "name_servers": [
            "brad.ns.cloudflare.com",
            "may.ns.cloudflare.com"
          ]
        },
        "mx": {
          "update_date": "2026-09-10T21:31:14Z",
          "mail_servers": [
            "mail.camckbusiness.com"
          ]
        },
        "soa": {
          "update_date": "2026-09-10T21:31:14Z",
          "mnames": [
            "brad.ns.cloudflare.com"
          ],
          "rnames": [
            "dns.cloudflare.com"
          ],
          "rname_emails": [
            "user@cloudflare.com"
          ]
        },
        "txt": {
          "update_date": "2026-09-10T21:31:14Z",
          "values": [
            "\"v=spf1 ip4:185.250.38.118 +a +mx +ip4:154.26.128.114 ~all\""
          ]
        },
        "cname": {
          "update_date": "2026-09-10T21:31:14Z",
          "values": []
        },
        "others": []
      },
      "dns_last_change_date": "2026-09-10T22:09:18Z",
      "ip_history": [
        "162.213.210.146",
        "154.26.128.114"
      ],
      "ssl": null,
      "ssl_last_change_date": "2024-09-29T21:48:47Z",
      "webdata": {
        "connection_status": "success",
        "html": {
          "source_code_hash": "bbd4c3043252a58fa2bd53acafa6e7e89044e9a51341b7721c7eb9cbe0eb985b"
        },
        "http": {
          "status_code_first": 301,
          "status_code_last": 200,
          "redirection_history": [
            {
              "url": "http://camckbusiness.com/",
              "status_code": 301
            },
            {
              "url": "https://www.camckbusiness.com/",
              "status_code": 200
            }
          ],
          "external_redirection": false,
          "final_url": "https://www.camckbusiness.com/",
          "final_fqdn": "www.camckbusiness.com",
          "final_domain": "camckbusiness.com",
          "headers": {
            "others": [
              {
                "name": "date",
                "value": "Wed, 15 Jul 2026 01:04:19 GMT"
              },
              {
                "name": "transfer_encoding",
                "value": "chunked"
              }
            ],
            "access_control_allow_headers": null,
            "access_control_allow_methods": null,
            "access_control_allow_origin": null,
            "cache_control": null,
            "clear_site_data": null,
            "content_encoding": "gzip",
            "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": "cloudflare",
            "set_cookie": null,
            "strict_transport_security": null,
            "x_content_type_options": null,
            "x_download_options": null,
            "x_frame_options": null,
            "x_permitted_cross_domain_policies": null,
            "x_powered_by": "PHP/8.4.22",
            "x_xss_protection": null
          },
          "cookies": []
        }
      }
    },
    {
      "punycode": "crmotors.com.gt",
      "unicode": "crmotors.com.gt",
      "is_idn": false,
      "subdomain": null,
      "subdomain_last": null,
      "subdomain_root": null,
      "name": {
        "punycode": "crmotors",
        "unicode": "crmotors",
        "is_idn": false,
        "contains_letter": true,
        "contains_number": false,
        "contains_hyphen": false,
        "length": 8,
        "lang": "en",
        "keywords": [
          "cr",
          "motors"
        ],
        "keyword_count": 2,
        "latinized": [],
        "contains_confusable": false
      },
      "domain": {
        "punycode": "crmotors.com.gt",
        "unicode": "crmotors.com.gt",
        "is_idn": false,
        "name": {
          "punycode": "crmotors",
          "unicode": "crmotors",
          "is_idn": false,
          "contains_letter": true,
          "contains_number": false,
          "contains_hyphen": false,
          "length": 8,
          "lang": "en",
          "keywords": [
            "cr",
            "motors"
          ],
          "keyword_count": 2
        },
        "extension": {
          "punycode": "com.gt",
          "unicode": "com.gt",
          "is_idn": false
        },
        "extension_root": {
          "punycode": "gt",
          "unicode": "gt",
          "is_idn": false
        },
        "extension_sub": {
          "punycode": "com",
          "unicode": "com",
          "is_idn": false
        },
        "extension_type": 2,
        "reserved": null,
        "premium": null,
        "registered": null,
        "whois": null,
        "whois_normalized": null,
        "whois_last_check_date": null,
        "whois_create_date_historical": [],
        "whois_last_change_date": null,
        "whois_registrant_email_historical": [],
        "whois_privacy_enabled": null,
        "dns": {
          "a": {
            "update_date": "2026-09-11T06:51:55Z",
            "ip_addresses": [
              "104.21.92.186",
              "172.67.197.29"
            ]
          }
        },
        "dns_last_change_date": "2026-09-11T07:12:11Z",
        "ip_history": [
          "104.21.92.186",
          "172.67.197.29"
        ],
        "ssl": {
          "validity": {
            "start_date": "2026-07-07T15:10:43Z",
            "end_date": "2026-10-05T16:08:15Z"
          },
          "serial_number": "14239782918769096226070793841473236476",
          "check_date": "2026-08-09T04:58:02Z"
        },
        "ssl_last_change_date": "2026-08-05T22:52:42Z"
      },
      "type": 1,
      "subdomain_level_count": 0,
      "dns": {
        "a": {
          "update_date": "2026-09-11T06:51:55Z",
          "ip_addresses": [
            "104.21.92.186",
            "172.67.197.29"
          ]
        },
        "aaaa": {
          "update_date": "2026-09-11T06:51:55Z",
          "ip_addresses": [
            "2606:4700:3035::6815:5cba",
            "2606:4700:3035::ac43:c51d"
          ]
        },
        "ns": {
          "update_date": "2026-09-11T06:51:55Z",
          "name_servers": [
            "major.ns.cloudflare.com",
            "may.ns.cloudflare.com"
          ]
        },
        "mx": {
          "update_date": "2026-09-11T06:51:55Z",
          "mail_servers": [
            "mx.domain-2210.example",
            "mx2.domain-2210.example"
          ]
        },
        "soa": {
          "update_date": "2026-09-11T06:51:55Z",
          "mnames": [
            "major.ns.cloudflare.com"
          ],
          "rnames": [
            "dns.cloudflare.com"
          ],
          "rname_emails": [
            "user@cloudflare.com"
          ]
        },
        "txt": {
          "update_date": "2026-09-11T06:51:55Z",
          "values": [
            "\"v=spf1 include:domain-2210.example include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all\"",
            "\"zoho-verification=zb40643732.zmverify.domain-2210.example\""
          ]
        },
        "cname": {
          "update_date": "2026-09-11T06:51:55Z",
          "values": []
        },
        "others": []
      },
      "dns_last_change_date": "2026-09-11T07:12:09Z",
      "ip_history": [
        "104.21.92.186",
        "172.67.197.29"
      ],
      "ssl": {
        "tags": [
          "dla"
        ],
        "fqdns": [
          "crmotors.com.gt"
        ],
        "version": 3,
        "serial_number": "14239782918769096226070793841473236476",
        "fingerprint": {
          "sha256": "e4464229aaad168ed5524c5346b807979ff06beeb42ea8edbaf5ed916306e364",
          "sha1": "5dba1a6a6de15347e1e33840f4906766f84b5202",
          "md5": "0f710db6a7ed7874db0bb5ef92c880ae"
        },
        "validity": {
          "start_date": "2026-07-07T15:10:43Z",
          "end_date": "2026-10-05T16:08:15Z",
          "length": 7779452
        },
        "signature": {
          "is_self_signed": false,
          "is_valid": true,
          "value": "MEYCIQCqfxrE4CH+mkwoAJRmvhMvJgMZ/SFvMaMYrm60oDpcIwIhAPQCw1M7RQ2j2xLtD57czdsab4ojuvQxEt+KaGSWJxTg",
          "algorithm": {
            "oid": "1.2.840.10045.4.3.2",
            "name": "sha256"
          }
        },
        "issuer_dn": "CN=WE1,O=Google Trust Services,C=US",
        "issuer": {
          "common_name": "WE1",
          "country": "US",
          "state": null,
          "locality": null,
          "organization": "Google Trust Services",
          "organizational_unit": null
        },
        "subject_dn": "CN=crmotors.com.gt",
        "subject": {
          "common_name": "crmotors.com.gt",
          "country": null,
          "state": null,
          "locality": null,
          "organization": null,
          "organizational_unit": null
        },
        "extensions": {
          "authority_key_id": "kHeSNWfE/6jMqeZ72YB5e8yT+Tg=",
          "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": false,
            "key_cert_sign": false,
            "crl_sign": false
          },
          "signed_certificate_timestamps": [
            "2026-07-07T16:10:43Z",
            "2026-07-07T16:10:44Z"
          ],
          "subject_alt_name": {
            "dns_names": [
              "crmotors.com.gt",
              "*.crmotors.com.gt"
            ]
          },
          "subject_key_id": "Bd2k09ym18v51irB0/rd/gWxfqI="
        },
        "check_date": "2026-08-09T04:58:02Z"
      },
      "ssl_last_change_date": "2026-08-05T22:52:40Z",
      "webdata": {
        "connection_status": "success",
        "html": {
          "source_code_hash": "684e3ea3bef55255bbc54695f8bd2b568f86b6995c70b335a137ff1393a1e322"
        },
        "http": {
          "status_code_first": 301,
          "status_code_last": 200,
          "redirection_history": [
            {
              "url": "http://crmotors.com.gt/",
              "status_code": 301
            },
            {
              "url": "https://crmotors.com.gt/",
              "status_code": 200
            }
          ],
          "external_redirection": false,
          "final_url": "https://crmotors.com.gt/",
          "final_fqdn": "crmotors.com.gt",
          "final_domain": "crmotors.com.gt",
          "headers": {
            "others": [
              {
                "name": "date",
                "value": "Mon, 27 Jul 2026 16:13:38 GMT"
              },
              {
                "name": "transfer_encoding",
                "value": "chunked"
              }
            ],
            "access_control_allow_headers": null,
            "access_control_allow_methods": null,
            "access_control_allow_origin": null,
            "cache_control": null,
            "clear_site_data": null,
            "content_encoding": "gzip",
            "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": "cloudflare",
            "set_cookie": null,
            "strict_transport_security": null,
            "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": []
        }
      }
    }
  ]
}
```

### 400 · Invalid Parameter (invalid apex=notabool)

```bash
curl 'https://api.deepinfo.com/v1/discovery/reverse-ns?ns=may.ns.cloudflare.com&apex=notabool' \
  -H 'apikey: YOUR_API_KEY' \
  -H 'Accept: application/json'
```

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

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

## Worked Examples

Worked examples of this endpoint, each on its own page with the exact request and its response: [Reverse NS Examples](/reference/discovery/reverse-ns/examples/).

- [Domains Using One Name Server](/reference/discovery/reverse-ns/examples/name-server/): The domains whose NS record names may.ns.cloudflare.com: 123,773 on the day of capture.
- [Domains on Google Name Servers](/reference/discovery/reverse-ns/examples/google-name-server/): The domains whose NS record names ns1.google.com: 4,782, among them Google domains in many TLDs.
- [Any Name Server Under the Same Domain](/reference/discovery/reverse-ns/examples/apex/): With apex=true, any name server under cloudflare.com matches: 52,267,578 domains instead of 123,773.