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// Other services

Port 6790: HNMP

Port 6790 is assigned by IANA to hnmp (HNMP).

6790

How hnmp works

Other services
client:6790hnmpresponse client:6790hnmpresponse

The client sends a request to port 6790 and the hnmp 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 6790 dangerous?

We have no specific security note for port 6790. 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 6790

ServicePortTransportDescriptionReferenceUpdated
hnmp 6790 TCP, UDP HNMP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 6790, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6790'      # process listening on 6790
sudo lsof -nP -i :6790

macOS

sudo lsof -nP -i :6790

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6790 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6790
netstat -ano | findstr :6790

From another machine

nmap -p 6790 -sV <host>
sudo nmap -sU -p 6790 <host>
nc -zv <host> 6790

Block it in the firewall

sudo ufw deny 6790/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6790" -Direction Inbound -LocalPort 6790 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6790 used for?

Port 6790 is assigned by IANA to hnmp (HNMP).

Is port 6790 TCP or UDP?

Port 6790 is registered for TCP and UDP.

Is it safe to open port 6790?

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 6790 is open?

On Linux run "ss -ltnup 'sport = :6790'", on macOS "lsof -nP -i :6790", and on Windows "netstat -ano | findstr :6790" to see the local process. From another machine, "nmap -p 6790 <host>" shows whether it is reachable.

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