Qstat

 QStat is a command-line program that displays information about Internet game
servers. The servers are either down, non-responsive, or running a game. For
servers running a game, the server name, map name, current number of players,
and response time are displayed. Server rules and player information may also be
displayed.

Games supported include Quake, QuakeWorld, Hexen II, Quake II, HexenWorld,
Unreal, Half-Life, Sin, Shogo, Tribes, Tribes 2, Quake III: Arena, BFRIS,
Kingpin, and Heretic II, Unreal Tournament, Soldier of Fortune, Rogue Spear,
Redline, Turok II, Blood 2, Descent 3, Drakan, KISS, Nerf Arena Blast, Rally
Master, Terminous, Wheel of Time, and Daikatana and many more. Note for Tribes
2: QStat only supports Tribes 2 builds numbered 22075 or higher. Note for Ghost
Recon QStat only supports GhostRecon patch 1.2, 1.3, 1.4, Desert Siege, and
Island Thunder.

Some games use query protocols compatible with an existing game. These servers
can be queried using the flags for the compatible game. For instance, Turok2
should work using the -uns flag. Unreal Tournament is also supported by the -uns
but is not really a different game. You can distinguish Unreal Tournament games
with the "minnetver" server rule (standard Unreal servers have a "mingamever"
server rule).

The Quake servers can be divided into two categories: POQS (Plain Old Quake
Server) and QuakeWorld. Quake shareware, Quake commercial (from CD), winquake,
winded, unixded, and Hexen II are all POQS. The various versions of QuakeWorld
and Quake II use a QuakeWorld type server. The distinction is based on network
protocol used to query the servers, and affects the kind of information
available for display.

The different server types can be queried simultaneously. If QStat detects that
this is being done, the output is keyed by the type of server being displayed.
See DISPLAY OPTIONS.

The game server may be specified as an IP address or a hostname. Servers can be
listed on the command-line or, with the use of the -f option, a text file.