Powie039's WHOIS Domain Check is a productivity plugin designed for WordPress users to easily check the availability of domain names. By using the [pwhois] shortcode, users can quickly embed a WHOIS lookup tool into their pages or posts. The plugin allows customization of the default top-level domain (TLD) through the shortcode attribute, such as setting .com as the default option.

While the TLD list is limited due to the specific WHOIS servers it supports, users can request additional TLDs for future updates. The plugin acknowledges that not all domain lookups will function perfectly due to potential changes in WHOIS server protocols. However, users are encouraged to report any issues, and in return, they may receive a complimentary upgrade to the Pro version of the plugin.