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// Other services

Port 44: MPM FLAGS Protocol

Port 44 is assigned by IANA to mpm-flags (MPM FLAGS Protocol).

44

How mpm-flags works

Other services
client:44mpm-flagsresponse client:44mpm-flagsresponse

The client sends a request to port 44 and the mpm-flags 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 44 dangerous?

We have no specific security note for port 44. 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 44

ServicePortTransportDescriptionReferenceUpdated
mpm-flags 44 TCP, UDP MPM FLAGS Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 44, and is it reachable?

Linux

sudo ss -ltnup 'sport = :44'      # process listening on 44
sudo lsof -nP -i :44

macOS

sudo lsof -nP -i :44

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 44 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 44
netstat -ano | findstr :44

From another machine

nmap -p 44 -sV <host>
sudo nmap -sU -p 44 <host>
nc -zv <host> 44

Block it in the firewall

sudo ufw deny 44/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 44" -Direction Inbound -LocalPort 44 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 44 used for?

Port 44 is assigned by IANA to mpm-flags (MPM FLAGS Protocol).

Is port 44 TCP or UDP?

Port 44 is registered for TCP and UDP.

Is it safe to open port 44?

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 44 is open?

On Linux run "ss -ltnup 'sport = :44'", on macOS "lsof -nP -i :44", and on Windows "netstat -ano | findstr :44" to see the local process. From another machine, "nmap -p 44 <host>" shows whether it is reachable.

05 Related
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