How to Fetch Domain Whois Data with Sockets in Python

By | August 6, 2020


The whois information of a domain name provides various details like registrar, owner, registration date, expiry date etc.

The whois information is provided by the corresponding whois servers of the registrars.

The information is available for free and most whois servers run a whois service on port 43 which provides whois data associated with a domain name.

The first step is to contact which provides the actual whois server of a domain name.

Next the particular whois server is contacted which provides the full whois data of the domain.

Implementation is quite simple and python makes it even simpler.



Program to fetch whois information of a domain name
import socket, sys

#Perform a generic whois query to a server and get the reply
def perform_whois(server , query) :
	#socket connection
	s = socket.socket(socket.AF_INET , socket.SOCK_STREAM)
	s.connect((server , 43))
	#send data
	s.send(query + '\r\n')
	#receive reply
	msg = ''
	while len(msg) < 10000:
		chunk = s.recv(100)
		if(chunk == ''):
		msg = msg + chunk
	return msg

#Function to perform the whois on a domain name
def get_whois_data(domain):
	#remove http and www
	domain = domain.replace('http://','')
	domain = domain.replace('www.','')
	#get the extension , .com , .org , .edu
	ext = domain[-3:]
	#If top level domain .com .org .net
	if(ext == 'com' or ext == 'org' or ext == 'net'):
		whois = ''
		msg = perform_whois(whois , domain)
		#Now scan the reply for the whois server
		lines = msg.splitlines()
		for line in lines:
			if ':' in line:
				words = line.split(':')
				if  'Whois' in words[0] and 'whois.' in words[1]:
					whois = words[1].strip()
	#Or Country level - contact to find the whois server of a particular TLD
		#Break again like , to uk
		ext = domain.split('.')[-1]
		#This will tell the whois server for the particular country
		whois = ''
		msg = perform_whois(whois , ext)
		#Now search the reply for a whois server
		lines = msg.splitlines()
		for line in lines:
			if ':' in line:
				words = line.split(':')
				if 'whois.' in words[1] and 'Whois Server (port 43)' in words[0]:
					whois = words[1].strip()
	#Now contact the final whois server
	msg = perform_whois(whois , domain)
	#Return the reply
	return msg
# end
# get the domain name from command line argument
domain_name = sys.argv[1]
print get_whois_data(domain_name)

Run the program by issuing the following command at the terminal.

$ python

The commandline argument should contain the domain name. The output would be the whois data.

The output data would look something like this:

$ python 
   Registry Domain ID: 108907621_DOMAIN_COM-VRSN
   Registrar WHOIS Server:
   Registrar URL:
   Updated Date: 2020-01-08T15:08:40Z
   Creation Date: 2003-12-26T19:18:07Z
   Registry Expiry Date: 2021-02-02T11:59:59Z
   Registrar:, Inc.
   Registrar IANA ID: 625
   Registrar Abuse Contact Email: [email protected]
   Registrar Abuse Contact Phone: 7202492374
   Domain Status: clientTransferProhibited
   Name Server: NS-1033.AWSDNS-01.ORG
   Name Server: NS-358.AWSDNS-44.COM
   DNSSEC: unsigned
   URL of the ICANN Whois Inaccuracy Complaint Form:
>>> Last update of whois database: 2020-08-06T14:05:09Z <<<

For more information on Whois status codes, please visit

NOTICE: The expiration date displayed in this record is the date the
registrar's sponsorship of the domain name registration in the registry is
currently set to expire. This date does not necessarily reflect the expiration
date of the domain name registrant's agreement with the sponsoring
registrar.  Users may consult the sponsoring registrar's Whois database to
view the registrar's reported date of expiration for this registration.

The above shows does not contain the full whois information about the domain. Instead it points to the registrar domain name like this:

Registrar WHOIS Server:

So the primary whois server "" tells us the registrar whois. Next we have to contact the registrar whois server in the same way and we shall get the full whois details of the domain name.


To learn the basics of socket programming in Python check out this post:
Python socket programming Tutorial - How to Code Client and Server

About Silver Moon

A Tech Enthusiast, Blogger, Linux Fan and a Software Developer. Writes about Computer hardware, Linux and Open Source software and coding in Python, Php and Javascript. He can be reached at [email protected].


How to Fetch Domain Whois Data with Sockets in Python
  1. anonimouse

    had this error:
    File “C:/Users/ryanc/Desktop/”, line 17, in perform_whois
    s.send(query + ‘rn’)
    TypeError: ‘str’ does not support the buffer interface

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