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Local dataset, no network
// Other services

Port 4351: PLCY Net Services

Port 4351 is assigned by IANA to plcy-net-svcs (PLCY Net Services).

4351

How plcy-net-svcs works

Other services
client:4351plcy-net-svcsresponse client:4351plcy-net-svcsresponse

The client sends a request to port 4351 and the plcy-net-svcs service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 4351 dangerous?

We have no specific security note for port 4351. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 4351

ServicePortTransportDescriptionReferenceUpdated
plcy-net-svcs 4351 TCP, UDP PLCY Net Services - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4351, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4351'      # process listening on 4351
sudo lsof -nP -i :4351

macOS

sudo lsof -nP -i :4351

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4351 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4351
netstat -ano | findstr :4351

From another machine

nmap -p 4351 -sV <host>
sudo nmap -sU -p 4351 <host>
nc -zv <host> 4351

Block it in the firewall

sudo ufw deny 4351/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4351" -Direction Inbound -LocalPort 4351 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4351 used for?

Port 4351 is assigned by IANA to plcy-net-svcs (PLCY Net Services).

Is port 4351 TCP or UDP?

Port 4351 is registered for TCP and UDP.

Is it safe to open port 4351?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 4351 is open?

On Linux run "ss -ltnup 'sport = :4351'", on macOS "lsof -nP -i :4351", and on Windows "netstat -ano | findstr :4351" to see the local process. From another machine, "nmap -p 4351 <host>" shows whether it is reachable.

05 Related
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