whatportis.com

Port 12342 services

2 entries are registered on port 1234. 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
udp · tcp

2 transports in use

in transit
0/2

entries encrypted on the wire

worst risk
2/10

1 of 2 iana-registered

Services on this port

ranked by lookups
portservicerisk
:1234VLC RTP Streamingsafe
:1234Infoseek Search Agentsafe

01VLC RTP Streamingudp · unofficial · risk 2/10

Port 1234 is commonly used by VLC media player for streaming audio and video content over UDP using RTP (Real-time Transport Protocol). It facilitates smooth, low-latency communication primarily in multicast or unicast streaming scenarios. Although unofficial, this port has become a de facto standard among VLC users for initiating media streams, making it popular in personal, educational, and corporate environments requiring live media distribution.

port 1234 as VLC RTP Streaming →
filed underStreamingMediaWeb Services

Which one is on your host

ask the machine, not the registry

The registry says what 1234 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 ':1234\b'
macos
lsof -nP -iTCP:1234 -sTCP:LISTEN
windows
netstat -ano | findstr :1234

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 1234 — 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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