There are fewer and fewer Classic Quake servers up these days. Most of the guys with decent bandwidth are not willing to host so old a game, so they've turned to Quake II and now Quake III, along with Half Life and others. Still, there are some very good servers left, most of which are Artifact servers or Team Fortress servers on QuakeWorld. The old standard Quake servers are hard to find and rarely full. The following are some of the better servers left, all of which you can find with Gamespy. Anyway, here they are:
Name and IP Address:
Marlinspike - 216.160.20.65
Electric Llamaland - 207.99.85.67
Topsid - 160.45.32.177
Darkzone - 209.172.184.218
Widowmaker - 209.96.178.230
The Zoo - 130.237.191.38
Doby.Junker.Org - 167.206.222.12
Net @ccess - 207.99.85.69
Gooland III - 167.206.58.65
Biscuit East Mega TF - 209.242.16.70
Not Larry's Mega TF - 207.79.239.252
It's up to you to see what servers catch your fancy. I reccomend Gooland most highly for good old Artifact Quake