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// Other services

Port 628: QMQP

Port 628 is assigned by IANA to qmqp (QMQP).

628

How qmqp works

Other services
client:628qmqpresponse client:628qmqpresponse

The client sends a request to port 628 and the qmqp 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 628 dangerous?

We have no specific security note for port 628. 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 628

ServicePortTransportDescriptionReferenceUpdated
qmqp 628 TCP, UDP QMQP - 2018-04-05

// source: IANA service name and port number registry

03 Check it

Which program uses port 628, and is it reachable?

Linux

sudo ss -ltnup 'sport = :628'      # process listening on 628
sudo lsof -nP -i :628

macOS

sudo lsof -nP -i :628

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 628 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 628
netstat -ano | findstr :628

From another machine

nmap -p 628 -sV <host>
sudo nmap -sU -p 628 <host>
nc -zv <host> 628

Block it in the firewall

sudo ufw deny 628/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 628" -Direction Inbound -LocalPort 628 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 628 used for?

Port 628 is assigned by IANA to qmqp (QMQP).

Is port 628 TCP or UDP?

Port 628 is registered for TCP and UDP.

Is it safe to open port 628?

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 628 is open?

On Linux run "ss -ltnup 'sport = :628'", on macOS "lsof -nP -i :628", and on Windows "netstat -ano | findstr :628" to see the local process. From another machine, "nmap -p 628 <host>" shows whether it is reachable.

05 Related
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