2 entries are registered on port 3723. 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.
services registered on this number
2 transports in use
entries encrypted on the wire
1 of 2 iana-registered
| port | service | proto | category | risk | views |
|---|---|---|---|---|---|
| :3723 | Battle.net Gaming | TCPUDP | Network Services | caution | 9.2k |
| :3723 | Sychron Service Daemon | TCPUDP | — | safe | 0 |
Port 3723 is widely used by many Blizzard Entertainment games through their Battle.net service, including iconic titles such as Diablo II, Warcraft II, Warcraft III, and StarCraft. The port facilitates game server communication, matchmaking, lobby coordination, and real-time multiplayer data exchange, supporting both TCP and UDP traffic to ensure smooth gameplay across different network conditions.
port 3723 as Battle.net Gaming →Port 3723 is assigned to the Sychron Service Daemon, a little-documented service registered by Robert Marinelli.
port 3723 as Sychron Service Daemon →The registry says what 3723 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.
ss -ltnp | grep ':3723\b'lsof -nP -iTCP:3723 -sTCP:LISTENnetstat -ano | findstr :3723On 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 3723 — 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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