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// Other services

Port 4551: MIH Services

Port 4551 is assigned by IANA to ieee-mih (MIH Services).

4551

How ieee-mih works

Other services
client:4551ieee-mihresponse client:4551ieee-mihresponse

The client sends a request to port 4551 and the ieee-mih 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
Registered (1024-49151)
Category
Other services
01 Security

Is port 4551 dangerous?

We have no specific security note for port 4551. 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 4551

ServicePortTransportDescriptionReferenceUpdated
ieee-mih 4551 TCP, UDP MIH Services RFC 5677 -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4551, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4551'      # process listening on 4551
sudo lsof -nP -i :4551

macOS

sudo lsof -nP -i :4551

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4551 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4551
netstat -ano | findstr :4551

From another machine

nmap -p 4551 -sV <host>
sudo nmap -sU -p 4551 <host>
nc -zv <host> 4551

Block it in the firewall

sudo ufw deny 4551/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4551" -Direction Inbound -LocalPort 4551 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4551 used for?

Port 4551 is assigned by IANA to ieee-mih (MIH Services).

Is port 4551 TCP or UDP?

Port 4551 is registered for TCP and UDP.

Is it safe to open port 4551?

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 4551 is open?

On Linux run "ss -ltnup 'sport = :4551'", on macOS "lsof -nP -i :4551", and on Windows "netstat -ano | findstr :4551" to see the local process. From another machine, "nmap -p 4551 <host>" shows whether it is reachable.

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