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// Other services

Port 8231: HNCP

Port 8231 is assigned by IANA to hncp-udp-port (HNCP).

8231

How hncp-udp-port works

Other services
client:8231hncp-udp-portresponse client:8231hncp-udp-portresponse

The client sends a request to port 8231 and the hncp-udp-port service answers.

Transport
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 8231 dangerous?

We have no specific security note for port 8231. 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 8231

ServicePortTransportDescriptionReferenceUpdated
hncp-udp-port 8231 UDP HNCP RFC 7788 2016-01-13
-8231-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 8231, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8231'      # process listening on 8231
sudo lsof -nP -i :8231

macOS

sudo lsof -nP -i :8231

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8231 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8231
netstat -ano | findstr :8231

From another machine

nmap -p 8231 -sV <host>
sudo nmap -sU -p 8231 <host>
nc -zv <host> 8231

Block it in the firewall

sudo ufw deny 8231/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8231" -Direction Inbound -LocalPort 8231 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 8231 used for?

Port 8231 is assigned by IANA to hncp-udp-port (HNCP).

Is port 8231 TCP or UDP?

Port 8231 is registered for UDP.

Is it safe to open port 8231?

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 8231 is open?

On Linux run "ss -ltnup 'sport = :8231'", on macOS "lsof -nP -i :8231", and on Windows "netstat -ano | findstr :8231" to see the local process. From another machine, "nmap -p 8231 <host>" shows whether it is reachable.

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