The domain checker helps to identify whether or not a particular domain name is available to register. The WHOIS lookup gives you access to further limited information regarding a registered domain. Should your requested domain name still be available, you can use both the WHOIS service, as well as the domain checker in order to easily register your desired domain name with IONOS. Furthermore, we recommend suitable domain alternatives in case a particular domain name is registered already. Regardless of whether you use our WHOIS lookup or domain checker, our main goal is to offer you the best support possible on your way to your desired domain name.