2 entries are registered on port 1109. 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 |
|---|---|---|---|---|---|
| :1109 | Reserved Port 1109 | UDP | Network Services | caution | 7.9k |
| :1109 | KPOP - Kerberos POP | TCP | safe | 7.9k |
Port 1109 is an officially reserved port number that is currently unassigned for any specific service or protocol by the IANA. It exists as a placeholder and may be allocated in the future for an emerging technology or application. At present, it does not have any standardized or widespread use in network communication.
port 1109 as Reserved Port 1109 →KPOP, or Kerberos Post Office Protocol, is a secure adaptation of the Post Office Protocol (POP) that leverages Kerberos authentication. It was designed to provide stronger security measures for email retrieval by integrating Kerberos' trusted ticket-based authentication system, thereby reducing risks associated with password-based methods.
port 1109 as KPOP - Kerberos POP →The registry says what 1109 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 ':1109\b'lsof -nP -iTCP:1109 -sTCP:LISTENnetstat -ano | findstr :1109On 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 1109 — 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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