2 entries are registered on port 99. It is a well-known port (0–1023) — assignments here are IANA's, and a service found on one is usually the service that was assigned it.
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 |
|---|---|---|---|---|---|
| :99 | WIP Message Protocol | TCP | Network Services | caution | 5.3k |
| :99 | Metagram Relay | TCPUDP | Network Services | safe | 0 |
The WIP Message Protocol operating over port 99 is a messaging or inter-process communication protocol used by specific applications or legacy systems. It facilitates data transfer between clients and servers, enabling message exchanging within a network. Though unofficial and not widely adopted, it supports specialized communication in niche environments.
port 99 as WIP Message Protocol →Metagram Relay traffic assigned to TCP and UDP port 99.
port 99 as Metagram Relay →The registry says what 99 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 ':99\b'lsof -nP -iTCP:99 -sTCP:LISTENnetstat -ano | findstr :99On 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 99 — 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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