JoinGG

Measured, not estimated

How many people still play Zombie Panic! Source?

39 players are on the 15 Zombie Panic! Source servers JoinGG is reaching right now, of 16 listed.

Across the 122 hours covered well enough to compare, that count has run between 13 and 47.

Every figure on this page was measured by JoinGG. We ask all 16 Zombie Panic! Source servers listed here every hour, over Valve's A2S status query (the same request the in-game server browser makes), and write down what each one answers. Nothing is scraped from another site, modelled, or extrapolated to servers we do not list — which is also the limit of it: these are the Zombie Panic! Source servers on JoinGG, so read the counts as a large sample of public community servers rather than as a census of the game.

Last sweep . This page rebuilds every five minutes.

39
Players connected

reported by the servers themselves

15
Servers answering

1 listed but silent

16
Servers listed

every one queried directly

11.3%
Slots used

of 345 slots those servers reported

These figures rest on 2,295 status checks across 169 measured hours, of which 122 cover enough of the Zombie Panic! Source list to compare with the others. Readings are kept for 7 days, so this page gets deeper as they accumulate rather than longer. By players on listed servers, Zombie Panic! Source is the 19th busiest of the 32 games JoinGG measures.

This is a small sample — 16 servers on Zombie Panic! Source. The counts below are still measurements rather than estimates, but a population read off 16 servers moves when one operator reboots, so treat it as what these servers are doing rather than as what the game is doing. The whole network is the wider view.

Players on Zombie Panic! Source servers, hour by hour

2,295 status checks · 169 hours measured

Sun 06:00 UTC — only 2 of 16 servers were reached this hour, so its total is not comparableSun 07:00 UTC — only 14 of 16 servers were reached this hour, so its total is not comparableSun 08:00 UTC — 33 players on 15 serversSun 09:00 UTC — 26 players on 16 serversSun 10:00 UTC — only 3 of 16 servers were reached this hour, so its total is not comparableSun 11:00 UTC — 23 players on 16 serversSun 12:00 UTC — 25 players on 15 serversSun 13:00 UTC — 35 players on 16 serversSun 14:00 UTC — 20 players on 16 serversSun 15:00 UTC — only 13 of 16 servers were reached this hour, so its total is not comparableSun 16:00 UTC — 44 players on 16 serversSun 17:00 UTC — only 3 of 16 servers were reached this hour, so its total is not comparableSun 18:00 UTC — 24 players on 15 serversSun 19:00 UTC — 31 players on 16 serversSun 20:00 UTC — 29 players on 16 serversSun 21:00 UTC — 30 players on 15 serversSun 22:00 UTC — 36 players on 16 serversSun 23:00 UTC — only 14 of 16 servers were reached this hour, so its total is not comparableMon 00:00 UTC — 28 players on 16 serversMon 01:00 UTC — 45 players on 15 serversMon 02:00 UTC — only 3 of 16 servers were reached this hour, so its total is not comparableMon 03:00 UTC — 46 players on 16 serversMon 04:00 UTC — 41 players on 15 serversMon 05:00 UTC — 38 players on 16 serversMon 06:00 UTC — 34 players on 16 serversMon 07:00 UTC — 29 players on 16 serversMon 08:00 UTC — only 13 of 16 servers were reached this hour, so its total is not comparableMon 09:00 UTC — 30 players on 16 serversMon 10:00 UTC — 24 players on 16 serversMon 11:00 UTC — only 2 of 16 servers were reached this hour, so its total is not comparableMon 12:00 UTC — 25 players on 16 serversMon 13:00 UTC — 21 players on 16 serversMon 14:00 UTC — 22 players on 16 serversMon 15:00 UTC — 28 players on 15 serversMon 16:00 UTC — 23 players on 16 serversMon 17:00 UTC — only 14 of 16 servers were reached this hour, so its total is not comparableMon 18:00 UTC — 24 players on 15 serversMon 19:00 UTC — only 3 of 16 servers were reached this hour, so its total is not comparableMon 20:00 UTC — 25 players on 16 serversMon 21:00 UTC — 30 players on 15 serversMon 22:00 UTC — 25 players on 16 serversMon 23:00 UTC — 25 players on 16 serversTue 00:00 UTC — 24 players on 16 serversTue 01:00 UTC — only 13 of 16 servers were reached this hour, so its total is not comparableTue 02:00 UTC — 37 players on 16 serversTue 03:00 UTC — only 3 of 16 servers were reached this hour, so its total is not comparableTue 04:00 UTC — 41 players on 15 serversTue 05:00 UTC — 41 players on 16 serversTue 06:00 UTC — 34 players on 16 serversTue 07:00 UTC — 27 players on 15 serversTue 08:00 UTC — only 14 of 16 servers were reached this hour, so its total is not comparableTue 09:00 UTC — only 3 of 16 servers were reached this hour, so its total is not comparableTue 10:00 UTC — 24 players on 15 serversTue 11:00 UTC — 23 players on 16 serversTue 12:00 UTC — 23 players on 16 serversTue 13:00 UTC — 22 players on 15 serversTue 14:00 UTC — 16 players on 15 serversTue 15:00 UTC — 21 players on 15 serversTue 16:00 UTC — only 3 of 16 servers were reached this hour, so its total is not comparableTue 17:00 UTC — 23 players on 15 serversTue 18:00 UTC — 23 players on 16 serversTue 19:00 UTC — 36 players on 16 serversTue 20:00 UTC — 30 players on 15 serversTue 21:00 UTC — only 14 of 16 servers were reached this hour, so its total is not comparableTue 22:00 UTC — 30 players on 16 serversTue 23:00 UTC — 26 players on 15 serversWed 00:00 UTC — only 3 of 16 servers were reached this hour, so its total is not comparableWed 01:00 UTC — 28 players on 16 serversWed 02:00 UTC — 43 players on 15 serversWed 03:00 UTC — 43 players on 16 serversWed 04:00 UTC — 43 players on 16 serversWed 05:00 UTC — 43 players on 16 serversWed 06:00 UTC — only 13 of 16 servers were reached this hour, so its total is not comparableWed 07:00 UTC — 22 players on 16 serversWed 08:00 UTC — only 3 of 16 servers were reached this hour, so its total is not comparableWed 09:00 UTC — 22 players on 15 serversWed 10:00 UTC — 23 players on 16 serversWed 11:00 UTC — 29 players on 16 serversWed 12:00 UTC — 21 players on 15 serversWed 13:00 UTC — 31 players on 16 serversWed 14:00 UTC — only 14 of 16 servers were reached this hour, so its total is not comparableWed 15:00 UTC — 23 players on 16 serversWed 16:00 UTC — only 2 of 16 servers were reached this hour, so its total is not comparableWed 17:00 UTC — 24 players on 16 serversWed 18:00 UTC — 24 players on 16 serversWed 19:00 UTC — 26 players on 15 serversWed 20:00 UTC — 24 players on 16 serversWed 21:00 UTC — only 14 of 16 servers were reached this hour, so its total is not comparableWed 22:00 UTC — 32 players on 15 serversWed 23:00 UTC — only 3 of 16 servers were reached this hour, so its total is not comparableThu 00:00 UTC — 38 players on 16 serversThu 01:00 UTC — 25 players on 15 serversThu 02:00 UTC — 33 players on 16 serversThu 03:00 UTC — 43 players on 16 serversThu 04:00 UTC — 43 players on 16 serversThu 05:00 UTC — only 13 of 16 servers were reached this hour, so its total is not comparableThu 06:00 UTC — 36 players on 16 serversThu 07:00 UTC — only 3 of 16 servers were reached this hour, so its total is not comparableThu 08:00 UTC — 31 players on 15 serversThu 09:00 UTC — 25 players on 16 serversThu 10:00 UTC — 24 players on 16 serversThu 11:00 UTC — 23 players on 15 serversThu 12:00 UTC — only 14 of 16 servers were reached this hour, so its total is not comparableThu 13:00 UTC — 30 players on 16 serversThu 14:00 UTC — only 2 of 16 servers were reached this hour, so its total is not comparableThu 15:00 UTC — 23 players on 16 serversThu 16:00 UTC — 28 players on 16 serversThu 17:00 UTC — 35 players on 15 serversThu 18:00 UTC — 37 players on 16 serversThu 19:00 UTC — only 14 of 16 servers were reached this hour, so its total is not comparableThu 20:00 UTC — 34 players on 16 serversThu 21:00 UTC — only 2 of 16 servers were reached this hour, so its total is not comparableThu 22:00 UTC — 28 players on 16 serversThu 23:00 UTC — 33 players on 16 serversFri 00:00 UTC — 38 players on 15 serversFri 01:00 UTC — 29 players on 16 serversFri 02:00 UTC — only 14 of 16 servers were reached this hour, so its total is not comparableFri 03:00 UTC — 42 players on 15 serversFri 04:00 UTC — only 3 of 16 servers were reached this hour, so its total is not comparableFri 05:00 UTC — 33 players on 16 serversFri 06:00 UTC — 32 players on 15 serversFri 07:00 UTC — 23 players on 16 serversFri 08:00 UTC — 20 players on 16 serversFri 09:00 UTC — 29 players on 16 serversFri 10:00 UTC — only 13 of 16 servers were reached this hour, so its total is not comparableFri 11:00 UTC — only 3 of 16 servers were reached this hour, so its total is not comparableFri 12:00 UTC — 20 players on 16 serversFri 13:00 UTC — 22 players on 15 serversFri 14:00 UTC — 23 players on 16 serversFri 15:00 UTC — 25 players on 16 serversFri 16:00 UTC — only 13 of 16 servers were reached this hour, so its total is not comparableFri 17:00 UTC — 29 players on 16 serversFri 18:00 UTC — 34 players on 16 serversFri 19:00 UTC — 36 players on 16 serversFri 20:00 UTC — only 14 of 16 servers were reached this hour, so its total is not comparableFri 21:00 UTC — only 2 of 16 servers were reached this hour, so its total is not comparableFri 22:00 UTC — 30 players on 16 serversFri 23:00 UTC — 37 players on 16 serversSat 00:00 UTC — 39 players on 15 serversSat 01:00 UTC — 25 players on 16 serversSat 02:00 UTC — only 14 of 16 servers were reached this hour, so its total is not comparableSat 03:00 UTC — 34 players on 16 serversSat 04:00 UTC — only 2 of 16 servers were reached this hour, so its total is not comparableSat 05:00 UTC — 39 players on 16 serversSat 06:00 UTC — 40 players on 16 serversSat 07:00 UTC — 34 players on 15 serversSat 08:00 UTC — only 14 of 16 servers were reached this hour, so its total is not comparableSat 09:00 UTC — 32 players on 16 serversSat 10:00 UTC — only 2 of 16 servers were reached this hour, so its total is not comparableSat 11:00 UTC — 30 players on 16 serversSat 12:00 UTC — 24 players on 16 serversSat 13:00 UTC — 13 players on 16 serversSat 14:00 UTC — only 13 of 16 servers were reached this hour, so its total is not comparableSat 15:00 UTC — 32 players on 16 serversSat 16:00 UTC — only 3 of 16 servers were reached this hour, so its total is not comparableSat 17:00 UTC — 41 players on 16 serversSat 18:00 UTC — 45 players on 15 serversSat 19:00 UTC — 39 players on 16 serversSat 20:00 UTC — 47 players on 16 serversSat 21:00 UTC — only 14 of 16 servers were reached this hour, so its total is not comparableSat 22:00 UTC — only 2 of 16 servers were reached this hour, so its total is not comparableSat 23:00 UTC — 34 players on 16 serversSun 00:00 UTC — 31 players on 16 serversSun 01:00 UTC — 42 players on 16 serversSun 02:00 UTC — 36 players on 15 serversSun 03:00 UTC — only 14 of 16 servers were reached this hour, so its total is not comparableSun 04:00 UTC — only 3 of 16 servers were reached this hour, so its total is not comparableSun 05:00 UTC — 47 players on 16 serversSun 06:00 UTC — 44 players on 15 servers
Sun 06:00 UTCSun 06:00 UTC
Busiest hour measured
47 at Sat 20:00 UTC
Quietest hour measured
13 at Sat 13:00 UTC
Latest sweep
44 players
Hours plotted
122 of 169

47 hours are marked but not plotted. The poller reached under 90% of the list in those hours, so the totals are low because fewer servers were asked — not because fewer people were playing. Drawing them on the same line would invent a drop.

The other player count

39
Players here

on the 15 servers JoinGG reached

34
In game (Valve)

everyone running it anywhere, per Steam

These two count different things

Players here is ours: people connected to the Zombie Panic! Source servers JoinGG lists, counted by asking each server. In game (Valve) is Steam's live count of everyone running Zombie Panic! Source anywhere — official matchmaking, single-player, community servers and idle menus included. Neither is a subset of the other that we can compute: our list is not every community server in existence, and Valve's total is not limited to multiplayer. So both are printed and neither is divided by the other.

Valve's figure comes from the Steam Web API and is cached for an hour, so it can lag ours by up to that much.

Our count is the bigger number here

We can see more players on the Zombie Panic! Source servers we list (39) than Valve reports for the entire game (34). That is not a mistake in either figure. Server queries count bots as players, because the protocol reports them as players — a bot-filled rotation looks busy to us. And Valve counts Steam clients, while a large share of the surviving population on the oldest GoldSrc titles plays on non-Steam builds, so those players are on the servers we query and invisible to Steam. Both effects push the same way, and on a twenty-five-year-old game they push hard enough to cross over.

Where those players are right now

The Zombie Panic! Source listings with the most people on them at the last sweep. Every figure in the row is what that server answered — the ping is our round trip to it, not yours, so read it as a rough measure of where the box is rather than of what you will get.

The Zombie Panic! Source servers listed on JoinGG with the most players on them at the last status query, with the player count, map and round trip each one reported.
ServerMapPlayersPingWhere
SuperConker's Treehouse Reloaded - 17 Years Of ZPS! [2009-20zpo_bluevelvet_sod_v618 / 24178 msUnited States 🇺🇸
DNAGames | Objective Maps | EUzpo_biotec10 / 20113 msSpain 🇪🇸
DNAGames | Survival + Horde | EUzps_nightmare10 / 2059 msUnited Kingdom 🇬🇧
SoldiersOfDemise.com | EU | Fungrades 2025 - 3.8.2zpo_church_skittles_sfr_v9a1 / 3251 msFrance 🇫🇷
All 16 Zombie Panic! Source servers

What they are actually playing

The count above is people on servers, and servers run modes. These are taken from what the Zombie Panic! Source servers report they are running, not from what their names say.

Zombie2

Zombie Panic! Source player counts — the questions

Is Zombie Panic! Source still alive in 2026?
Yes, and this is the measurement rather than an opinion. 39 players are on the 15 Zombie Panic! Source servers JoinGG is reaching right now, of 16 listed. Across the 122 hours covered well enough to compare, that count has run between 13 and 47. Every one of those numbers came from asking the servers themselves.
When is Zombie Panic! Source busiest?
Around 03:00 UTC. Averaged over 5 days of readings, that hour carries about 42 players across the Zombie Panic! Source servers listed here.
How many Zombie Panic! Source servers are there?
16 Zombie Panic! Source servers are listed on JoinGG, and 15 of them answered the last status query. The other 1 stayed silent, which is recorded as silent rather than as empty — a server that does not answer and a server with nobody on it are different facts and we only measured one of them.
Why is this different from Steam's Zombie Panic! Source player count?
They measure different populations. Steam counts everybody running Zombie Panic! Source anywhere right now — official matchmaking, single-player, community servers and idle menus — and reports 34. We count people connected to the 15 Zombie Panic! Source servers we reached, which is 39. Neither figure is a subset of the other that we can compute, so both are printed and neither is divided by the other.
How is this counted?
Every figure on this page was measured by JoinGG. We ask all 16 Zombie Panic! Source servers listed here every hour, over Valve's A2S status query (the same request the in-game server browser makes), and write down what each one answers. Nothing is scraped from another site, modelled, or extrapolated to servers we do not list — which is also the limit of it: these are the Zombie Panic! Source servers on JoinGG, so read the counts as a large sample of public community servers rather than as a census of the game.

Readings are kept for 7 days and pruned by the poller, so this page describes the last week rather than all time — it gets deeper as readings accumulate rather than longer. Hours are measured in UTC and shown in your own clock; hover any of them to read the UTC figure behind it. The answers above stay in UTC, because each is also published as structured data for search engines, where a reader’s zone means nothing.

How many people still play the others

Every game JoinGG measures with enough servers behind it to publish, busiest first. The number on each is the players we can see on its listed servers right now.

Minecraft44,947FiveM32,603Counter-Strike 1.67,769Counter-Strike: Source3,596Team Fortress 21,939Garry's Mod1,422Counter-Strike 21,343Counter-Strike: Global Offensive478Left 4 Dead 2409Day of Defeat390Half-Life288Day of Defeat: Source286Team Fortress Classic246Counter-Strike: Condition Zero244Half-Life 2: Deathmatch128Insurgency (2014)76Natural Selection71Rust50Left 4 Dead36Space Engineers257 Days to Die18Fortress Forever12Alien Swarm0Insurgency (Source)0