The S5 Domain Chcecker module is a FREE module that you can add to any Joomla site. This module provides your customers a quick and easy way to see if a domain is available to be purchased or if someone else already owns the domain. There are over a dozen domains to search from and in the administration you can choose which ones show and which ones do not show. Along with that you can choose to redirect your visitors to a new page on page submit.
Demo
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Demo
Download