CyberHunter
Local dataset, no network
// Other services

Port 29: MSG ICP

Port 29 is assigned by IANA to msg-icp (MSG ICP).

29

How msg-icp works

Other services
client:29msg-icpresponse client:29msg-icpresponse

The client sends a request to port 29 and the msg-icp 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 29 dangerous?

We have no specific security note for port 29. 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 29

ServicePortTransportDescriptionReferenceUpdated
msg-icp 29 TCP, UDP MSG ICP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 29, and is it reachable?

Linux

sudo ss -ltnup 'sport = :29'      # process listening on 29
sudo lsof -nP -i :29

macOS

sudo lsof -nP -i :29

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 29 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 29
netstat -ano | findstr :29

From another machine

nmap -p 29 -sV <host>
sudo nmap -sU -p 29 <host>
nc -zv <host> 29

Block it in the firewall

sudo ufw deny 29/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 29" -Direction Inbound -LocalPort 29 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 29 used for?

Port 29 is assigned by IANA to msg-icp (MSG ICP).

Is port 29 TCP or UDP?

Port 29 is registered for TCP and UDP.

Is it safe to open port 29?

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 29 is open?

On Linux run "ss -ltnup 'sport = :29'", on macOS "lsof -nP -i :29", and on Windows "netstat -ano | findstr :29" to see the local process. From another machine, "nmap -p 29 <host>" shows whether it is reachable.

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