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Port 39782 services

2 entries are registered on port 3978. It is a registered port (1024–49151) — IANA records an assignee, but nothing stops other software from listening here, which is why the number carries more than one entry.

entries
2

services registered on this number

transport
tcp · udp

2 transports in use

in transit
0/2

entries encrypted on the wire

worst risk
4/10

1 of 2 iana-registered

Services on this port

ranked by lookups
portservicerisk
:3978OpenTTD Master Servercaution
:3978Secured Configuration Serversafe

01OpenTTD Master Servertcp · udp · unofficial · risk 4/10

Port 3978 is primarily used by OpenTTD, an open-source transport simulation game modeled after Transport Tycoon Deluxe. This port facilitates communication between game clients and the master server as well as the content service, enabling server listings, multiplayer session coordination, and in-game content updates. It supports both TCP for reliable data transfer and UDP for efficient game state synchronization.

port 3978 as OpenTTD Master Server →
filed underGamingNetwork Services

Which one is on your host

ask the machine, not the registry

The registry says what 3978 is registered to. What is listening on it right now is decided by the host, and only the host can be asked. Each of these prints the process behind the socket.

linux
ss -ltnp | grep ':3978\b'
macos
lsof -nP -iTCP:3978 -sTCP:LISTEN
windows
netstat -ano | findstr :3978

On Linux and Windows the process name comes back with the socket; on macOS lsof needs sudo to name a process that isn't yours. Match what it prints against the 2 entries above.

A port number is not a service. Anything may listen on 3978 — what you actually met is decided by the host, not the registry. If a service is missing here, it belongs in the registry.

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