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// Other services

Port 612: HMMP Indication

Port 612 is assigned by IANA to hmmp-ind (HMMP Indication).

612

How hmmp-ind works

Other services
client:612hmmp-indresponse client:612hmmp-indresponse

The client sends a request to port 612 and the hmmp-ind 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 612 dangerous?

We have no specific security note for port 612. 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 612

ServicePortTransportDescriptionReferenceUpdated
hmmp-ind 612 TCP, UDP HMMP Indication - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 612, and is it reachable?

Linux

sudo ss -ltnup 'sport = :612'      # process listening on 612
sudo lsof -nP -i :612

macOS

sudo lsof -nP -i :612

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 612 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 612
netstat -ano | findstr :612

From another machine

nmap -p 612 -sV <host>
sudo nmap -sU -p 612 <host>
nc -zv <host> 612

Block it in the firewall

sudo ufw deny 612/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 612" -Direction Inbound -LocalPort 612 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 612 used for?

Port 612 is assigned by IANA to hmmp-ind (HMMP Indication).

Is port 612 TCP or UDP?

Port 612 is registered for TCP and UDP.

Is it safe to open port 612?

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 612 is open?

On Linux run "ss -ltnup 'sport = :612'", on macOS "lsof -nP -i :612", and on Windows "netstat -ano | findstr :612" to see the local process. From another machine, "nmap -p 612 <host>" shows whether it is reachable.

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