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Unfortunately, the list of players is often incomplete. This is not a bug on my side but one in the UT server. Sometimes trying for a few times can get you a larger list, but often not :(

Infiltration servers
Server Map GameType Players
List fetched on Thu, 29 Jul 2010 16:37:43 +0200 | View source
INF Coop #1 (Unreal+RTNP) w/ PsyTex-1.0 [inf.cerberon.net]
cerberon.net:17778
DasaPass Coop No players
INF Coop #2 (custom maps, fast d/l) w/ PsyTex-1.0 [inf.cerberon.net]
cerberon.net:27778
USP-02-Sarevok Coop No players
-= XploD =- PsyTex TDM Server
xplod.de:7778
DM-INF-Scramble2003final TDM No players
-= XploD2 =- PsyTex Coop Server
xplod.de:8889
zp05-nitromining-INF Coop No players