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// Other services

Port 46: MPM [default send]

Port 46 is assigned by IANA to mpm-snd (MPM [default send]).

46

How mpm-snd works

Other services
client:46mpm-sndresponse client:46mpm-sndresponse

The client sends a request to port 46 and the mpm-snd 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 46 dangerous?

We have no specific security note for port 46. 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 46

ServicePortTransportDescriptionReferenceUpdated
mpm-snd 46 TCP, UDP MPM [default send] - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 46, and is it reachable?

Linux

sudo ss -ltnup 'sport = :46'      # process listening on 46
sudo lsof -nP -i :46

macOS

sudo lsof -nP -i :46

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 46 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 46
netstat -ano | findstr :46

From another machine

nmap -p 46 -sV <host>
sudo nmap -sU -p 46 <host>
nc -zv <host> 46

Block it in the firewall

sudo ufw deny 46/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 46" -Direction Inbound -LocalPort 46 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 46 used for?

Port 46 is assigned by IANA to mpm-snd (MPM [default send]).

Is port 46 TCP or UDP?

Port 46 is registered for TCP and UDP.

Is it safe to open port 46?

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 46 is open?

On Linux run "ss -ltnup 'sport = :46'", on macOS "lsof -nP -i :46", and on Windows "netstat -ano | findstr :46" to see the local process. From another machine, "nmap -p 46 <host>" shows whether it is reachable.

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