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

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

Check (whois) domain names for availability. Easy integration via shortcode or widget.

Quick Whois Plugin Shows Whois information of the provided domain name. You can do this using Widget/Shortcode.

This is Whois XML API integration for your WordPress website, which allows adding tooltips with whois information for each domain name in your post content or comments.

Your best sales leads are visiting your website - anonymously. Get details about companies and the people who work there without any web registration.

Provides usage of Whois service in WP (fully Russian)

Provides usage of Whois service in WP Позволяет организовывать проверку доменов и получение whois информации в WP

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