Port 43 - whois
It is a TCP-based transaction-oriented query/response protocol listening on TCP port 43 by default. We can use it for querying databases containing domain names, IP addresses, or autonomous systems and provide information services to Internet users.
The Internet Corporation of Assigned Names and Numbers (ICANN) requires that accredited registrars enter the holder's contact information, the domain's creation, and expiration dates, and other information in the Whois database immediately after registering a domain. In simple terms, the Whois database is a searchable list of all domains currently registered worldwide.
Sysinternals WHOIS for Windows or Linux WHOIS command-line utility are our preferred tools for gathering information. However, there are some online versions like whois.domaintools.com we can also use.
Last update: 2023-07-02 Created: July 2, 2023 20:08:45