Domain Name

By | 22/02/2015




Protocol to obtain information about a domain name.

It uses TCP port 43

telnet 43 - search for the
?? - provides help

There are two server modes:

  • Thick – Stores all the data of the domain although it’s not the authoritative WHOIS
  • Thin – Stores minimum data of the domain and points to the appropiate WHOIS

Each Top Level Registry chooses the method. .com and .net operates Thin WHOIS mode while .org operates Thick WHOIS mode.

Whois server: