Curiosity about RO servers

[Raely]

rael ~ $ nmap -O 91.123.197.138
Starting Nmap 5.00 ( http://nmap.org ) at 2010-03-03 14:01 CET
Interesting ports on 91.123.197.138:
Not shown: 998 closed ports
PORT    STATE    SERVICE
22/tcp  open     ssh
135/tcp filtered msrpc
Device type: general purpose
Running: Linux 2.6.X
OS details: Linux 2.6.18 - 2.6.27
Network Distance: 10 hops

That IP address come from "sv_game_server_host" variable on my game.cfg file.