i dunno about all classes but these have most of them, i think
The Panquake House: [US ?]
68.232.179.138:27015
Trashed Gamers MGE server: [US ?]
64.16.211.35:27016
Reddit Atlanta MGE server: [US E]
173.234.164.114:27205
{TAUNT} Training: [US ?]
69.172.242.180:27018
West TOO MGE Mod: [US W]
64.94.101.38:27015
AsiaFortress MGE #2: [Asia]
175.156.200.28:27016
Panquake House Europe: [EU]
108.61.254.239:27015
Trolling Bunnies MGE: [EU]
213.108.29.123:27010
JR MGE Server: [EU]
188.165.220.10:27016
Team 2166 MGE Training Server: [??]
203.217.24.61:27015
UGC MGE Server: [NA ?]
74.91.114.65:27015
??? [Germany?]
84.200.5.109:27015