On 2 servers with real players, out of 3 Steam servers that run it now, farms and empty ones included. Checked 23:24 UTC.
css_inferno is a community map, not one of the maps that come with the game. Servers send it to players when they join.
Over the last 30 days css_inferno was the #48 map on CS 1.6 Steam servers, with 12 real players on it at any moment on average - 0.2% of everyone playing. It ran on about 2 servers with real players at a time. Right now 28 people play it on 2 servers, most of them on servers in Germany. It is busiest on Thursday around 19:00 UTC and quietest on Monday around 16:00 UTC, when about 19.5 times fewer people play it.
Right now 28, on 2 servers from the Steam server list. Over the last 30 days it had 12 real players on average at any moment. Fake servers and bots are not counted.
On Thursday around 19:00 UTC. The grid above shows every hour of the week in your own time zone.
The busiest right now: CS.STARCS.RO - VIP FREE [Campanie admine] -REVIVE SYSTEM/Ranksystem /skins (25 players), SERAHOR CS:GO MOD | GLOBAL | csg.serahor.com (3 players), CS2•Fury•CSGO Remake (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_inferno205 players on average
de_dust2_2x2116 players on average
de_aztec88 players on average
fy_snow78 players on average
de_nuke70 players on average
de_dust59 players on average
cs_assault53 players on average
de_mirage51 players on average
de_train46 players on average
fy_pool_day45 players on average
zm_foda42 players on average