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// Other services

Port 16310: Policy Distribute, Update Notification

Port 16310 is assigned by IANA to pduncs (Policy Distribute, Update Notification).

16310

How pduncs works

Other services
client:16310pduncsresponse client:16310pduncsresponse

The client sends a request to port 16310 and the pduncs 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 16310 dangerous?

We have no specific security note for port 16310. 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 16310

ServicePortTransportDescriptionReferenceUpdated
pduncs 16310 TCP, UDP Policy Distribute, Update Notification - 2006-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 16310, and is it reachable?

Linux

sudo ss -ltnup 'sport = :16310'      # process listening on 16310
sudo lsof -nP -i :16310

macOS

sudo lsof -nP -i :16310

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 16310 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 16310
netstat -ano | findstr :16310

From another machine

nmap -p 16310 -sV <host>
sudo nmap -sU -p 16310 <host>
nc -zv <host> 16310

Block it in the firewall

sudo ufw deny 16310/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 16310" -Direction Inbound -LocalPort 16310 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 16310 used for?

Port 16310 is assigned by IANA to pduncs (Policy Distribute, Update Notification).

Is port 16310 TCP or UDP?

Port 16310 is registered for TCP and UDP.

Is it safe to open port 16310?

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 16310 is open?

On Linux run "ss -ltnup 'sport = :16310'", on macOS "lsof -nP -i :16310", and on Windows "netstat -ano | findstr :16310" to see the local process. From another machine, "nmap -p 16310 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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