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// Other services

Port 8232: HNCP over DTLS

Port 8232 is assigned by IANA to hncp-dtls-port (HNCP over DTLS).

8232

How hncp-dtls-port works

Other services
client:8232#%&@!x9response? client:8232#%&@!x9response?

The client sends a request to port 8232 and the hncp-dtls-port service answers. Everything is encrypted: someone on the path only sees unreadable bytes.

Transport
UDP
Exposure risk
not rated depends on the program listening
Encryption
EncryptedTLS or built-in crypto
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 8232 dangerous?

We have no specific security note for port 8232. 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 8232

ServicePortTransportDescriptionReferenceUpdated
hncp-dtls-port 8232 UDP HNCP over DTLS RFC 7788 2016-01-13
-8232-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 8232, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8232'      # process listening on 8232
sudo lsof -nP -i :8232

macOS

sudo lsof -nP -i :8232

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8232 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8232
netstat -ano | findstr :8232

From another machine

nmap -p 8232 -sV <host>
sudo nmap -sU -p 8232 <host>
nc -zv <host> 8232

Block it in the firewall

sudo ufw deny 8232/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8232" -Direction Inbound -LocalPort 8232 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 8232 used for?

Port 8232 is assigned by IANA to hncp-dtls-port (HNCP over DTLS).

Is port 8232 TCP or UDP?

Port 8232 is registered for UDP.

Is it safe to open port 8232?

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 8232 is open?

On Linux run "ss -ltnup 'sport = :8232'", on macOS "lsof -nP -i :8232", and on Windows "netstat -ano | findstr :8232" to see the local process. From another machine, "nmap -p 8232 <host>" shows whether it is reachable.

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