IP2WHOIS WHOIS Lookup API helps users to obtain domain information, WHOIS record, by using a domain name. The WHOIS API returns a comprehensive WHOIS data such as creation date, updated date, expiration date, domain age, the contact information of the registrant, mailing address, phone number, email address, nameservers the domain is using and much more. IP2WHOIS supports the query for 1113 TLDs and 634 ccTLDs.
Note: IP2WHOIS Free API allows you to query up to 500 WHOIS domain name per month.

WHOIS lookup REST API

GET https://api.ip2whois.com/v2

Request Parameter

Parameter Description
key (required) WHOIS lookup API license key.
domain (required) Domain name.
format (optional) Returns the API response in json (default) or xml format. Valid values: json | xml

Response Parameter

Parameter Description
domain Domain name.
domain_id Domain name ID.
status Domain name status.
create_date Domain name creation date.
update_date Domain name updated date.
expire_date Domain name expiration date.
domain_age Domain name age in day(s).
whois_server WHOIS server name.
registrar.iana_id Registrar IANA ID.
registrar.name Registrar name.
registrar.url Registrar URL.
registrant.name Registrant name.
registrant.organization Registrant organization.
registrant.street_address Registrant street address.
registrant.city Registrant city.
registrant.region Registrant region.
registrant.zip_code Registrant ZIP Code.
registrant.country Registrant country.
registrant.phone Registrant phone number.
registrant.fax Registrant fax number.
registrant.email Registrant email address.
admin.name Admin name.
admin.organization Admin organization.
admin.street_address Admin street address.
admin.city Admin city.
admin.region Admin region.
admin.zip_code Admin ZIP Code.
admin.country Admin country.
admin.phone Admin phone number.
admin.fax Admin fax number.
admin.email Admin email address.
tech.name Tech name.
tech.organization Tech organization.
tech.street_address Tech street address.
tech.city Tech city.
tech.region Tech region.
tech.zip_code Tech ZIP Code.
tech.country Tech country.
tech.phone Tech phone number.
tech.fax Tech fax number.
tech.email Tech email address.
billing.name Billing name.
billing.organization Billing organization.
billing.street_address Billing street address.
billing.city Billing city.
billing.region Billing region.
billing.zip_code Billing ZIP Code.
billing.country Billing country.
billing.phone Billing phone number.
billing.fax Billing fax number.
billing.email Billing email address.
name_servers Name servers
GET /v2
curl "https://api.ip2whois.com/v2?key={your_license_key}&domain={domain_name}"

Sample codes for other languages

Response
{
    "domain": "greendot.com",
    "domain_id": "600750_DOMAIN_COM-VRSN",
    "status": "registered",
    "create_date": "1997-11-03T00:00:00Z",
    "update_date": "2019-10-29T01:25:57Z",
    "expire_date": "2021-11-02T05:00:00Z",
    "domain_age": 8103,
    "whois_server": "whois.corporatedomains.com",
    "registrar": {
        "iana_id": "299",
        "name": "CSC CORPORATE DOMAINS, INC.",
        "url": "www.cscprotectsbrands.com"
    },
    "registrant": {
        "name": "Admin Role",
        "organization": "Green Dot Corporation",
        "street_address": "",
        "city": "Pasadena",
        "region": "CA",
        "zip_code": "91107",
        "country": "US",
        "phone": "+1.8664120548",
        "fax": "+1.8664120548",
        "email": "adminrole@greendotcorp.com"
    },
    "admin": {
        "name": "Admin Role",
        "organization": "Green Dot Corporation",
        "street_address": "",
        "city": "Pasadena",
        "region": "CA",
        "zip_code": "91107",
        "country": "US",
        "phone": "+1.8664120548",
        "fax": "+1.8664120548",
        "email": "adminrole@greendotcorp.com"
    },
    "tech": {
        "name": "Admin Role",
        "organization": "Green Dot Corporation",
        "street_address": "",
        "city": "Pasadena",
        "region": "CA",
        "zip_code": "91107",
        "country": "US",
        "phone": "+1.8664120548",
        "fax": "+1.8664120548",
        "email": "adminrole@greendotcorp.com"
    },
    "billing": {
        "name": "",
        "organization": "",
        "street_address": "",
        "city": "",
        "region": "",
        "zip_code": "",
        "country": "",
        "phone": "",
        "fax": "",
        "email": ""
    },
    "nameservers": "ns1.greendotdns.com, ns2.greendotdns.com"
}

SDK

You may use our official SDK to assist you in code implementation

WHOIS lookup Sample Code

<?php
$apiKey = 'Enter_License_Key';
$params['domain'] = 'Enter_Domain_Name';
$params['format'] = 'json';

$query = '';

foreach($params as $key=>$value){
    $query .= '&' . $key . '=' . rawurlencode($value);
}

$result = file_get_contents('https://api.ip2whois.com/v2?key=' . $apiKey . $query);

$data = json_decode($result);

print_r($data);
?>
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Hashtable;
import java.util.Map;

public class test {
    public static void main(String[] args) {
        try {
            String key = "Enter_License_Key";
            Hashtable<String, String> data = new Hashtable<String, String>();
            data.put("domain", "Enter_Domain_Name");
            data.put("format", "json");
            
            String datastr = "";
            for (Map.Entry<String,String> entry : data.entrySet()) {
                datastr += "&" + entry.getKey() + "=" + URLEncoder.encode(entry.getValue(), "UTF-8");
            }
            URL url = new URL("https://api.ip2whois.com/v2?key=" + key + datastr);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setRequestProperty("Accept", "application/json");
            
            if (conn.getResponseCode() != 200) {
                throw new RuntimeException("Failed : HTTP error code : " + conn.getResponseCode());
            }
            
            BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
            
            String output;
            
            while ((output = br.readLine()) != null) {
                System.out.println(output);
            }
            conn.disconnect();
        }
        catch (MalformedURLException e) {
            e.printStackTrace();
        }
        catch (IOException e) {
            e.printStackTrace();
        }
    }
}
Imports System.Net
Imports System.IO
Imports System.Uri

Public Class _Default
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim request As HttpWebRequest = Nothing
        Dim response As HttpWebResponse = Nothing

        Dim apiKey As String = "Enter_License_Key"
        Dim data As New Dictionary(Of String, String)

        data.Add("domain", "Enter_Domain_Name")
        data.Add("format", "json")
        Dim datastr As String = String.Join("&", data.[Select](Function(x) x.Key & "=" & EscapeDataString(x.Value)).ToArray())

        request = Net.WebRequest.Create("https://api.ip2whois.com/v2?key=" & apiKey & "&" & datastr)

        request.Method = "GET"
        response = request.GetResponse()

        Dim reader As System.IO.StreamReader = New IO.StreamReader(response.GetResponseStream())

        Page.Response.Write(reader.ReadToEnd)

    End Sub

End Class
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Net;
using System.IO;

namespace WebApplication1
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            WebRequest request = null;
            WebResponse response = null;

            string apiKey = "Enter_License_Key";
            Dictionary<string, string> data = new Dictionary<string, string>();

            data.Add("domain", "Enter_Domain_Name");
            data.Add("format", "json");
            string datastr = string.Join("&", data.Select(x => x.Key + "=" + System.Uri.EscapeDataString(x.Value)).ToArray());

            request = System.Net.WebRequest.Create("https://api.ip2whois.com/v2?key=" + apiKey + "&" + datastr);

            request.Method = "GET";
            response = request.GetResponse();

            System.IO.StreamReader reader = new System.IO.StreamReader(response.GetResponseStream());

            Page.Response.Write(reader.ReadToEnd());
        }
    }
}
import urllib.parse, http.client

p = { 'key': 'Enter_License_Key', 'domain': 'Enter_Domain_Name', 'format': 'json' }

conn = http.client.HTTPSConnection("api.ip2whois.com")
conn.request("GET", "/v2?" + urllib.parse.urlencode(p))
res = conn.getresponse()
print res.read()
require 'uri'
require 'net/http'

uri = URI.parse("https://api.ip2whois.com/v2")
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true
request = Net::HTTP::Post.new(uri.request_uri)
request.set_form_data({
  'key' => 'Enter_License_Key',
  'domain' => 'Enter_Domain_Name',
  'format' => 'json'
})

response = http.request(request)

if response == nil
  return false
else
  return response
end
var https = require('https');
let data = {
    key: 'Enter_License_Key',
    domain: 'Enter_Domain_Name',
    format: 'json',
};

let urlStr = 'https://api.ip2whois.com/v2?';

Object.keys(data).forEach(function (key, index) {
    if (this[key] != '') {
        urlStr += key + '=' + encodeURIComponent(this[key]) + '&';
    }
}, data);

urlStr = urlStr.substring(0, urlStr.length - 1);

let d = '';
let req = https.get(urlStr, function (res) {
    res.on('data', (chunk) => (d = d + chunk));
    res.on('end', function () {
        console.log(JSON.parse(d));
    });
});

req.on('error', function (e) {
    console.log(e);
});

Error Codes

error_code error_message
10000 Missing parameter.
10001 API key not found.
10002 API key disabled.
10003 API key expired.
10004 Insufficient credits.
10005 Unknown error.
10006 No data found.
10007 Invalid domain.
10008 Invalid format.
Error Object Response
{
    "error": {
        "error_code": 10000,
        "error_message": "Missing parameter."
    }
}

Try WHOIS Domain REST API to lookup domain information for FREE.