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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 Mon, 21 May 2012 11:15:32 +0200 | View source
-= XploD2 =- Coop Server with PsyTex 1.2 camos only
xplod.de:8889
USP-01-Hellscrag Coop 1 Players:
Koldunas
-= XploD =- TDM Server with PsyTex 1.2 camos
xplod.de:7778
DM-INF-ChandlerAve TDM No players