Enter any domain name, host ip address, or AS handle you would like to query a whois for. (i.e. w3dt.net or 18.104.22.168)
WHOIS (pronounced "who is"; not an acronym) is a query/response protocol which is widely used for querying an official database in order to determine the owner of a domain name, an IP address, or an autonomous system number on the Internet. WHOIS lookups were traditionally made using a command line interface, but a number of simplified web-based tools now exist for looking up domain ownership details from different databases. Web-based WHOIS clients still rely on the WHOIS protocol to connect to a WHOIS server and do lookups, and command-line WHOIS clients are still quite widely used by system administrators. WHOIS normally runs on TCP port 43.
The WHOIS system originated as a method that system administrators could use to look up information to contact other IP address or domain name administrators (almost like a "white pages"). The use of the data that is returned from query responses has evolved from those origins into a variety of uses including:
Presently ICANN is undertaking a study to determine the uses and abuses of WHOIS information. Other studies that are ongoing concern the accuracy of WHOIS information, and the effectiveness of the processes for reporting inaccurate public WHOIS information.
Due to the potential vulnerability of WHOIS information to improper manipulation, the legal owner of the domain is considered to be whoever controls the domain's username/passwords, e-mail address, and administrative features.
The w3dt whois lookup tool is based off Ruby code from David Nedved (2013) & ruby-whois.