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// Other services

Port 1731: MSICCP

Port 1731 is assigned by IANA to msiccp (MSICCP).

1731

How msiccp works

Other services
client:1731msiccpresponse client:1731msiccpresponse

The client sends a request to port 1731 and the msiccp 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 1731 dangerous?

We have no specific security note for port 1731. 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 1731

ServicePortTransportDescriptionReferenceUpdated
msiccp 1731 TCP, UDP MSICCP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1731, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1731'      # process listening on 1731
sudo lsof -nP -i :1731

macOS

sudo lsof -nP -i :1731

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1731 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1731
netstat -ano | findstr :1731

From another machine

nmap -p 1731 -sV <host>
sudo nmap -sU -p 1731 <host>
nc -zv <host> 1731

Block it in the firewall

sudo ufw deny 1731/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1731" -Direction Inbound -LocalPort 1731 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1731 used for?

Port 1731 is assigned by IANA to msiccp (MSICCP).

Is port 1731 TCP or UDP?

Port 1731 is registered for TCP and UDP.

Is it safe to open port 1731?

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 1731 is open?

On Linux run "ss -ltnup 'sport = :1731'", on macOS "lsof -nP -i :1731", and on Windows "netstat -ano | findstr :1731" to see the local process. From another machine, "nmap -p 1731 <host>" shows whether it is reachable.

05 Related
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