CyberHunter
LinkedIn profile - Bastien Cordier Email: contact@bastiencordier.pro
// Other services

Port 16311: Policy definition and update management

Port 16311 is assigned by IANA to pdefmns (Policy definition and update management).

16311

How pdefmns works

Other services
client:16311pdefmnsresponse client:16311pdefmnsresponse

The client sends a request to port 16311 and the pdefmns 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 16311 dangerous?

We have no specific security note for port 16311. 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 16311

ServicePortTransportDescriptionReferenceUpdated
pdefmns 16311 TCP, UDP Policy definition and update management - 2007-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 16311, and is it reachable?

Linux

sudo ss -ltnup 'sport = :16311'      # process listening on 16311
sudo lsof -nP -i :16311

macOS

sudo lsof -nP -i :16311

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 16311 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 16311
netstat -ano | findstr :16311

From another machine

nmap -p 16311 -sV <host>
sudo nmap -sU -p 16311 <host>
nc -zv <host> 16311

Block it in the firewall

sudo ufw deny 16311/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 16311" -Direction Inbound -LocalPort 16311 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 16311 used for?

Port 16311 is assigned by IANA to pdefmns (Policy definition and update management).

Is port 16311 TCP or UDP?

Port 16311 is registered for TCP and UDP.

Is it safe to open port 16311?

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 16311 is open?

On Linux run "ss -ltnup 'sport = :16311'", on macOS "lsof -nP -i :16311", and on Windows "netstat -ano | findstr :16311" to see the local process. From another machine, "nmap -p 16311 <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

Latest vulnerability news

All news