Most of the big ones don't --
Quakenet -> Auth with Q
DALnet -> NickServ
Rizon -> NickServ
Undernet -> Auth with CService [X?]
GameSurge -> AuthServ
BRASnet -> NickServ
[WHOA!! MAJOR SARCASM COMING UP]
yeah.. only 6 of the (currenty) top 8. Mmm.. yeah.. 2 of 8 is most definatly the 'most' portion.
[END OF MAJOR SARCASM]
In fact you'll find _MOST_ nets _DO_ provide some kind of Nickname Service - the functionality of that service differs greatly between networks, but still, most nets do have one.
