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// Other services

Port 218: Netix Message Posting Protocol

Port 218 is assigned by IANA to mpp (Netix Message Posting Protocol).

218

How mpp works

Other services
client:218mppresponse client:218mppresponse

The client sends a request to port 218 and the mpp 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 218 dangerous?

We have no specific security note for port 218. 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 218

ServicePortTransportDescriptionReferenceUpdated
mpp 218 TCP, UDP Netix Message Posting Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 218, and is it reachable?

Linux

sudo ss -ltnup 'sport = :218'      # process listening on 218
sudo lsof -nP -i :218

macOS

sudo lsof -nP -i :218

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 218 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 218
netstat -ano | findstr :218

From another machine

nmap -p 218 -sV <host>
sudo nmap -sU -p 218 <host>
nc -zv <host> 218

Block it in the firewall

sudo ufw deny 218/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 218" -Direction Inbound -LocalPort 218 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 218 used for?

Port 218 is assigned by IANA to mpp (Netix Message Posting Protocol).

Is port 218 TCP or UDP?

Port 218 is registered for TCP and UDP.

Is it safe to open port 218?

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 218 is open?

On Linux run "ss -ltnup 'sport = :218'", on macOS "lsof -nP -i :218", and on Windows "netstat -ano | findstr :218" to see the local process. From another machine, "nmap -p 218 <host>" shows whether it is reachable.

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