18 Most Active WordPress Whois Plugins

Check Domain WHOIS Lookup for availability. Simple insert the [pwhois] shortcode on a page or post

Provides the ability to retrieve information on a commentators IP address without leaving the "edit-comments.php" page.

Just a simple plugin to detect if a visitor is using ipv6 or not.

Show visitor IP Address and linked it to http://whois.domaintools.com, everytime they click at the link they will be redirected to see where they come

This plugin intended to lookup for domain registrant data.

A simple dashboard widget to Whois lookup domain name registration information.

Simple whois tool in a widget

DomainTools whois plugin shows whois data for domains found in blog articles and links them to whois.domaintools.com.

WhoisMind.com widget allows users to enter a hostname, ip address or email and displays all public domain information and related data.

Provides usage of Whois service in WP (fully Russian)

With hieWPwhois Plugin you can query domain status and whois (DomainavailibilityCHecK).