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WHMCS "ISPAPI" Domainchecker Add-on

semantic-release Build Status License: MIT PRs welcome

This Repository covers the "ISPAPI" Domainchecker Add-On for WHMCS. It provides the following features in WHMCS:

Supported Features

The ISPAPI DomainChecker addon supports the following functions and features:

  • NEW Support WHMCS' TLD Group Labels hot, new and sale
  • NEW Supports several filters
  • NEW Administrative Interface now allows managing of categories by drag'n'drop and provides access to all useful configurations
  • UPDATE Search trigger over URL (helpful for landing pages, see Usage Guide)
  • High-performance Domain Availability Checks using our registrar API
  • Support of Premium Domains (Aftermarket and Registry Premium Domains)
  • Domain Name Suggestion Engine integrated
  • Categorization of the TLDs for an improved user experience
    • NEW WHMCS' default categories can be imported
    • Search results based on the category selection
  • Backorder button in the search results (when having also our whmcs backorder module installed)
    • Add or Remove backorders instantly in the search results
  • WHOIS information for taken domains
  • Featuring each domain with availability and type of premium domain name
  • Featuring prices of domains
    • Registration and renewal prices
    • Premium domains with markup prices
  • Add or Remove domains to the cart instantly in the search results
  • Supports multiple currencies
  • Support for English and German. (If any other language is required, please contact us)
  • Ajax driven search (no page reload)
  • Easy to install and use

... and MORE!


NOTE: We introduced sematic-release starting with v8.0.0. This is why older Release Versions do not appear in the current changelog. But these versions appear in the release overview and in the old changelog.

Usage Guide

Download the ZIP archive including the latest release version here.

Read the following to get more information ...

Minimum Requirements

For the latest WHMCS minimum system requirements, please refer to

Domainchecker version ISPAPI Registrar Module version WHMCS version
>= 12.0.0 >= 3.0.0 >= 7.8.x
>= 11.0.0 >= 1.8.1 >= 7.8.x
>= 10.0.0 >= 1.8.1 >= 7.2.x
>= 9.0.0 < 10.0.0 >= 1.7.1
>= 8.3.0 < 9.0.0 >= 1.0.53

Compatibility with older WHMCS versions - is a matter of trial and error. We started gathering this information starting with v10.0.0 of the domainchecker addon.


Please read our development guide for details on our code of conduct, and the process for submitting pull requests to us.


  • Kai Schwarz - lead developer - PapaKai
  • Anthony Schneider - former developer - AnthonySchn
  • Tulasi Seelamkurthi - former developer - Tulsi91

See also the list of contributors who participated in this project.


This project is licensed under the MIT License - see the LICENSE file for details.