2 entries are registered on port 754. 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
1 transport in use
entries encrypted on the wire
1 of 2 iana-registered
| port | service | proto | category | risk | views |
|---|---|---|---|---|---|
| :754 | Kerberos Slave Propagation | TCP | Security | safe | 7.6k |
| :754 | Tell Send | TCP | Network Services | caution | 4.9k |
Port 754 is used by Kerberos version 5 to propagate database updates from a primary KDC (Key Distribution Center) to secondary or slave KDCs. This replication ensures all KDCs maintain consistent authentication credentials across the Kerberos realm, which is crucial for maintaining a unified and secure authentication environment.
port 754 as Kerberos Slave Propagation →Port 754, commonly known as Tell Send, is historically associated with legacy UNIX-based messaging utilities. It enables simple message passing between users on networked systems, primarily used in academic or internal organizational environments. While largely obsolete today, it represents an early form of network communication predating modern instant messaging and collaboration tools.
port 754 as Tell Send →The registry says what 754 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 ':754\b'lsof -nP -iTCP:754 -sTCP:LISTENnetstat -ano | findstr :754On 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 754 — 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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