On 0 servers with real players, out of 1 Steam servers that run it now, farms and empty ones included. Checked 09:05 UTC.
By its name, de_dust_castle is a community edit of the official de_dust, not the map that comes with the game. Servers send it to players when they join.
Over the last 30 days de_dust_castle was the #336 map on CS 1.6 Steam servers, with 2 real players on it at any moment on average - 0% of everyone playing. It ran on about <1 servers with real players at a time. Right now 0 people play it on 0 servers. It is busiest on Sunday around 22:00 UTC and quietest on Monday around 05:00 UTC.
Right now 0, on 0 servers from the Steam server list. Over the last 30 days it had 2 real players on average at any moment. Fake servers and bots are not counted.
On Sunday around 22:00 UTC. The grid above shows every hour of the week in your own time zone.
The busiest right now: WristHaX.com | CSDM|FFA Slaughter House [1000FPS|NYC] (0 players). The full list is under "Servers running it now", and every server has its own page with its history.
de_dust21,623 players on average
de_inferno206 players on average
de_dust2_2x2115 players on average
de_aztec89 players on average
fy_snow78 players on average
de_nuke71 players on average
de_dust59 players on average
cs_assault53 players on average
de_mirage52 players on average
de_train46 players on average
fy_pool_day45 players on average
zm_foda42 players on average