Since 2012, to get the list of servers in your game you'll need the Master Patch for your version of RtCW.
If you play 1.0-1.32 this fix might do the trick: MP 1.0 Master Server + PunkBuster Installer. When playing 1.4-1.41b you need the MP 1.4 Master Server + PunkBuster Fix. Tnx s4ndmod. And if thát doesn't help check this page. Doesn't work?
Keep in mind the masterserver could be down for a few days (still happens every now and than) and add these to your Favs..
These are
great servers that make this report usefull and even good'ol games possible. Is not just a list :)
Serveradmins should add wolfmaster.s4ndmod.com and dpmaster.deathmask.net to cvar sv_master5 or ^Wh.
If these are down, within a week alternative(s) can be derived via the normal channels. Read about that in the Arch.