2 entries are registered on port 2525. 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 |
|---|---|---|---|---|---|
| :2525 | SMTP Alternate | TCP | caution | 4.9k | |
| :2525 | MS V-Worlds | TCPUDP | — | safe | 0 |
Port 2525 is widely used as an alternative SMTP (Simple Mail Transfer Protocol) port for email message submission, particularly as a workaround when ISP restrictions or firewall policies block the default SMTP port 25. While unofficial, it has become popular among email service providers for facilitating reliable outbound email delivery.
port 2525 as SMTP Alternate →MS V-Worlds is an obscure service assigned to TCP and UDP port 2525.
port 2525 as MS V-Worlds →The registry says what 2525 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 ':2525\b'lsof -nP -iTCP:2525 -sTCP:LISTENnetstat -ano | findstr :2525On 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 2525 — 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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