whatportis.com

Port 5202 services

2 entries are registered on port 520. 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.

entries
2

services registered on this number

transport
udp · tcp

2 transports in use

in transit
0/2

entries encrypted on the wire

worst risk
4/10

2 of 2 iana-registered

Services on this port

ranked by lookups
portservicerisk
:520Routing Information Protocol (RIP)caution
:520EFS Servercaution

01Routing Information Protocol (RIP)udp · iana-registered · risk 4/10

Routing Information Protocol (RIP) is one of the oldest distance-vector routing protocols, widely used in small and medium-sized networks. It facilitates the sharing of routing information among routers, enabling consistent and automated updating of routing tables in an IP network environment. Known for its simplicity and ease of configuration, RIP plays an essential role in dynamic routing, though it has largely been superseded by more advanced protocols in larger or more complex network infrastructures.

port 520 as Routing Information Protocol (RIP) →

02EFS Servertcp · iana-registered · risk 4/10

The Extended File Name Server (EFS) operates on port 520. It facilitates handling of file name mapping and directory services, often associated with older UNIX and DEC systems to provide name services over networks. Although largely supplanted by modern directory protocols, it historically played a role in distributed file environments.

port 520 as EFS Server →
filed underNetwork ServicesFile TransferSystem

Which one is on your host

ask the machine, not the registry

The registry says what 520 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.

linux
ss -ltnp | grep ':520\b'
macos
lsof -nP -iTCP:520 -sTCP:LISTEN
windows
netstat -ano | findstr :520

On 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 520 — 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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