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  5. Query Master Server

Mcps
Mcps
Tool

Query Master Server

query_master_server

Discover live QuakeLive servers by querying Valve's Steam master server (`hl2master.steampowered.com:27011`). Since QuakeLive moved to Steam in 2015 all game servers register with Valve's Steam master instead of the old Quake 3 master (`master.quake3arena.com`). This tool uses the Steam Master Server Query Protocol to retrieve the full list of registered server addresses. Each address can then be passed to `send_connectionless_packet` with `getinfo` or `getstatus` for detailed per-server information. The master may return several hundred addresses split across multiple UDP packets. Each batch uses the last received address as the seed for the next request on the **same socket** (required by the protocol). Collection stops when the terminal sentinel `0.0.0.0:0` arrives or `max_servers` is reached. Default filter: `\\appid\\282440` (QuakeLive Steam AppID). **Master-level filters** (sent in the request, free): `has_players`, `map`, `gametype_tags`, `dedicated`, `secure`, `password_protected`, `linux`, `region`, `extra_filter`. **Per-server probe filters** (each server is queried individually — use `max_servers` to cap cost): A2S_INFO probes: `min_players`, `max_players`, `no_bots`; A2S_PLAYER probe: `player_name` (case-insensitive substring match against connected player names — pair with `has_players: true` to avoid probing empty servers). Control probe behaviour with `probe_timeout_ms` and `probe_concurrency`. Servers that do not respond are excluded.

Pricing

Per call

$0.02

Model

time-based

Pay only for what you use. No subscriptions.
Inputs

dedicated

booleannull

offset

integernull

no_bots

booleannull

master_address

stringnull

secure

booleannull

max_servers

integernull

min_players

integernull

probe_concurrency

integernull

extra_filter

stringnull

has_players

booleannull

password_protected

booleannull

linux

booleannull

limit

integernull

gametype_tags

arraynull

max_players

integernull

player_name

stringnull

timeout_ms

integernull

region

integernull

app_id

integernull

map

stringnull

probe_timeout_ms

integernull
Try It
API
MCP Config
Input Parameters
dedicated
Only return dedicated servers (`true`). Maps to the `\\type\\d` Steam filter clause. Most QuakeLive servers are dedicated; omit unless you specifically need to exclude listen servers.
offset
Skip this many addresses before returning results. Defaults to `0`.
no_bots
Exclude servers that have any bots (`true`). Triggers an A2S_INFO probe per server.
master_address
Steam master server address in `host:port` form. Defaults to `"hl2master.steampowered.com:27011"`. Multiple DNS A-records exist behind this hostname.
secure
Only return VAC anti-cheat secured servers (`true`). Maps to `\\secure\\1`.
max_servers
Stop collecting after this many unique server addresses. The master may return thousands; this caps the result. Defaults to `500`.
min_players
Only include servers with **at least** this many connected players. Triggers an A2S_INFO probe per server. Pair with `max_servers` to limit probe count.
probe_concurrency
Maximum number of A2S_INFO probes to run concurrently. Clamped to [1, 200]. Defaults to `50`. Higher values finish faster but consume more sockets.
extra_filter
Raw Steam master server filter clauses appended verbatim after all named filters, e.g. `"\\\\napp\\\\440"`. Each clause must begin with `\\`. Use for filter options not covered by the named fields above.
has_players
Only return servers that have at least one connected player. Maps to the `\\empty\\1` Steam filter clause. Omit (or `false`) to include empty servers.
password_protected
Filter by password requirement. `true` = only password-protected servers; `false` = only open servers. Omit to include both. Maps to `\\password\\1` or `\\password\\0`.
linux
Only return Linux-hosted servers (`true`). Maps to `\\linux\\1`.
limit
Maximum number of addresses to include in the response. Defaults to all collected addresses.
gametype_tags
Only return servers whose Steam tags include **all** of the listed gametype strings (AND-match). Supply one or more tags. QuakeLive examples: `["ca"]` (Clan Arena), `["ffa"]` (Free-for-All), `["tdm"]` (Team Deathmatch), `["duel"]`, `["ctf"]` (Capture the Flag), `["1v1"]`, `["ft"]` (Freeze Tag), `["harvester"]`, `["dom"]` (Domination), `["ad"]` (Attack & Defend), `["rr"]` (Red Rover). Maps to `\\gametype\\<t1>,<t2>,…`.
max_players
Only include servers with **at most** this many connected players. Useful to find servers that are not full. Triggers an A2S_INFO probe per server.
player_name
Case-insensitive substring to match against connected player names. Only servers that have at least one player whose name contains this string are returned. Triggers an A2S_PLAYER probe on every candidate server (uses the same `probe_timeout_ms` and `probe_concurrency` settings). Pair with `has_players: true` to skip empty servers before probing, which significantly reduces the number of individual queries sent.
timeout_ms
Per-request receive timeout in milliseconds. Clamped to [500, 15000]. Defaults to `5000` ms.
region
One-byte region code. `255` (0xFF) = all regions (default). `0` = US East, `1` = US West, `2` = South America, `3` = Europe, `4` = Asia, `5` = Australia, `6` = Middle East, `7` = Africa.
app_id
Steam AppID used as the `\\appid\\<id>` filter. Defaults to `282440` (QuakeLive). Change to `2200` for Quake III Arena, or consult SteamDB for other titles.
map
Only return servers running this exact map name, e.g. `"campgrounds"` or `"bloodrun"`. Maps to `\\map\\<name>`. Case-sensitive.
probe_timeout_ms
Timeout for each individual A2S_INFO probe in milliseconds. Clamped to [100, 5000]. Defaults to `1000` ms. Servers that do not reply within this window are excluded from results when probe filters are active.
Cost per run
Execution cost
$0.02
Deducted from your xPay allowance
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