CyberHunter
Local dataset, no network
// Other services

Port 613: HMMP Operation

Port 613 is assigned by IANA to hmmp-op (HMMP Operation).

613

How hmmp-op works

Other services
client:613hmmp-opresponse client:613hmmp-opresponse

The client sends a request to port 613 and the hmmp-op 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 613 dangerous?

We have no specific security note for port 613. 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 613

ServicePortTransportDescriptionReferenceUpdated
hmmp-op 613 TCP, UDP HMMP Operation - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 613, and is it reachable?

Linux

sudo ss -ltnup 'sport = :613'      # process listening on 613
sudo lsof -nP -i :613

macOS

sudo lsof -nP -i :613

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 613 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 613
netstat -ano | findstr :613

From another machine

nmap -p 613 -sV <host>
sudo nmap -sU -p 613 <host>
nc -zv <host> 613

Block it in the firewall

sudo ufw deny 613/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 613" -Direction Inbound -LocalPort 613 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 613 used for?

Port 613 is assigned by IANA to hmmp-op (HMMP Operation).

Is port 613 TCP or UDP?

Port 613 is registered for TCP and UDP.

Is it safe to open port 613?

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 613 is open?

On Linux run "ss -ltnup 'sport = :613'", on macOS "lsof -nP -i :613", and on Windows "netstat -ano | findstr :613" to see the local process. From another machine, "nmap -p 613 <host>" shows whether it is reachable.

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