AfterNET does not believe in using nickname registration. We have an AuthServ instead of a NickServ, where you can register an account, but NOT reserve a nickname.
Nicknames on AfterNET are first-come, first-serve. If the one you want or normally use is being used by someone else, choose another. There are millions of possible nicknames, no reason to argue over them.
See our How to ID Someone page for information about seeing who is who without registered nicks.