WP Domain Checker is a WordPress plugin that allows you to easily check the availability of a domain name from your WordPress site. You can check or search for any generic top-level domains (gTLDs) or country code top-level domains (ccTLDs). WP Domain Checker is made with AJAX and is easy to use with shortcodes or widgets, also integrated with WHMCS and WooCommerce.

Demo:

 WP Domain Checker Features
Check the availability of the domain name for any gTLD and ccTLD
Whois domain name
Made with AJAX
It's easy to use multiple checks with Shortcode
Easy to use with widget
Easy to check from the admin panel
Easy to configure from the admin panel
No need for a domain reseller API
Custom link for partners
Integrated with WHMCS
Integrated with WooCommerce
IDN domain verification support
Protected by the new Google reCAPTCHA
Support for more than 300 TLDs
Allow only certain TLD extensions to be checked
Custom prices for WooCommerce
Custom CSS
Unlimited colors
Checking multiple TLDs