In the past few years, we have covered plenty of awesome themes and plugins for web hosts and domain registrars. Dominion is another plugin that adds a domain name checker to your site. It is designed to work with or without WPBakery page builder. The plugin is built with AJAX and integrates with WHMCS.
Dominion is not only great for domain search but also transfers. It can check the availability for any TLD. Thanks to reCAPTCHA, you can keep spammers at bay. The plugin has highly customizable settings, so you can change length, labels, tags, colors, and a whole lot more.
Fluent-Themes is the coder behind this plugin. You can find out more about it here.