It's not the be all end all though. A lot of the domains listed are not usable by most people. If you've got a script searching for available domains you don't

It's not the be all end all though. A lot of the domains listed are not usable by most people. If you've got a script searching for available domains you don't really want it wasting time searching dictionary words on *.accident-investigation.aero as they'll probably all flag legit, meaning if you use the DNS lookup then whois method you've wasted a lot of time searching for domains you can't have.