2 entries are registered on port 4001. 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 |
|---|---|---|---|---|---|
| :4001 | Microsoft Ants | TCP | Gaming | caution | 7.7k |
| :4001 | NewOak | TCPUDP | — | safe | 0 |
Port 4001 is primarily known for supporting Microsoft Ants, an early multiplayer strategy game that used Microsoft's Gaming Zone infrastructure for player connectivity and communication. Although the game is now discontinued, the port remains historically notable for its role in online gaming in the early 2000s, facilitating data exchange, session management, and peer communication between players.
port 4001 as Microsoft Ants →NewOak is an obscure service assignment on TCP/UDP port 4001; protocol and deployment details are not publicly established.
port 4001 as NewOak →The registry says what 4001 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 ':4001\b'lsof -nP -iTCP:4001 -sTCP:LISTENnetstat -ano | findstr :4001On 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 4001 — 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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