whatportis.com

Port 53512 services

2 entries are registered on port 5351. 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
7/10

2 of 2 iana-registered

Services on this port

ranked by lookups
portservicerisk
:5351NAT-PMPcaution
:5351Port Control Protocolrisk

01NAT-PMPtcp · udp · iana-registered · risk 5/10

NAT Port Mapping Protocol (NAT-PMP) enables client devices behind a NAT gateway to configure dynamic port mappings automatically, simplifying inbound connection management. This improves connectivity for services such as peer-to-peer applications, gaming, and remote access without manual network configuration. Operating over both TCP and UDP, it allows devices to communicate their requirements directly to the NAT device to facilitate seamless data exchange while maintaining a level of security and network segmentation.

port 5351 as NAT-PMP →
filed underSecurityNetwork Services

Which one is on your host

ask the machine, not the registry

The registry says what 5351 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 ':5351\b'
macos
lsof -nP -iTCP:5351 -sTCP:LISTEN
windows
netstat -ano | findstr :5351

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 5351 — 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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