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Port 55012 services

2 entries are registered on port 5501. 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.

entries
2

services registered on this number

transport
tcp · udp

2 transports in use

in transit
0/2

entries encrypted on the wire

worst risk
4/10

1 of 2 iana-registered

Services on this port

ranked by lookups
portservicerisk
:5501Hotline File Transfercaution
:5501fcp-addr-srvr2safe

01Hotline File Transfertcp · unofficial · risk 4/10

Port 5501 is primarily used for Hotline, a classic client-server software popular in the late 1990s for file sharing, messaging, and community building. This port specifically handles file transfer connections within the Hotline ecosystem, enabling users to upload and download files on Hotline servers efficiently. Despite its decline in mainstream use, some legacy systems or enthusiasts may still utilize this port for archival purposes or nostalgia communities.

port 5501 as Hotline File Transfer →
filed underFile TransferNetwork Services

Which one is on your host

ask the machine, not the registry

The registry says what 5501 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 ':5501\b'
macos
lsof -nP -iTCP:5501 -sTCP:LISTEN
windows
netstat -ano | findstr :5501

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 5501 — 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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