DNS Lookup Examples · Example 10 of 13 in Record Types

PTR Record: Reverse DNS

GEThttps://api.deepinfo.com/v1/lookup/dns

The PTR record of 8.8.8.8: reverse DNS, asked for as 8.8.8.8.in-addr.arpa, answers dns.google.

Param: domain type
Value: 8.8.8.8.in-addr.arpa PTR

Asks for the PTR record of 8.8.8.8.in-addr.arpa.

domain does not take an IP address, but a reverse-DNS name works: the address's octets in reverse order under in-addr.arpa. The answer is the host name of 8.8.8.8, dns.google..

Request

curl

curl 'https://api.deepinfo.com/v1/lookup/dns?domain=8.8.8.8.in-addr.arpa&type=PTR' \
  -H 'apikey: YOUR_API_KEY' \
  -H 'Accept: application/json'

Python

import requests

url = "https://api.deepinfo.com/v1/lookup/dns"

params = {
    "domain": "8.8.8.8.in-addr.arpa",
    "type": "PTR"
}

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/lookup/dns?domain=8.8.8.8.in-addr.arpa&type=PTR";

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/lookup/dns?domain=8.8.8.8.in-addr.arpa&type=PTR", 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/lookup/dns?domain=8.8.8.8.in-addr.arpa&type=PTR"))
            .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/lookup/dns?domain=8.8.8.8.in-addr.arpa&type=PTR");
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/lookup/dns?domain=8.8.8.8.in-addr.arpa&type=PTR',
    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/lookup/dns?domain=8.8.8.8.in-addr.arpa&type=PTR')

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

{
  "fqdn": "8.8.8.8.in-addr.arpa",
  "requested_types": [
    "PTR"
  ],
  "responses": [
    {
      "type": "PTR",
      "conn_status": "success",
      "rcode": "NOERROR",
      "raw": "8.8.8.8.in-addr.arpa. 1701 IN PTR dns.google.",
      "values": [
        "dns.google."
      ],
      "server": "8.8.8.8"
    }
  ],
  "servers": [
    "8.8.8.8"
  ],
  "check_date": "2026-09-24T07:48:26Z"
}

Content-Type: application/json
ratelimit-limit: 100000
ratelimit-remaining: 99990
ratelimit-reset: 34
x-ratelimit-limit-minute: 100000
x-ratelimit-remaining-minute: 99990
deepinfo-request-id: 5f0c6a8e-1b2d-4c3e-9f4a-7b8c9d0e1f2a

Request

What this example sends. Every parameter is documented on DNS; the exact request is in the code panel.

Parameter	Value
`domain`query	`8.8.8.8.in-addr.arpa`
`type`query	`PTR`

Reference updated September 24, 2026

Request

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