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// Other services

Port 4742: SICCT

Port 4742 is assigned by IANA to sicct (SICCT), sicct-sdp (SICCT Service Discovery Protocol).

4742

How sicct works

Other services
client:4742sicctresponse client:4742sicctresponse

The client sends a request to port 4742 and the sicct service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 4742 dangerous?

We have no specific security note for port 4742. 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 4742

ServicePortTransportDescriptionReferenceUpdated
sicct 4742 TCP SICCT - -
sicct-sdp 4742 UDP SICCT Service Discovery Protocol - 2006-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 4742, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4742'      # process listening on 4742
sudo lsof -nP -i :4742

macOS

sudo lsof -nP -i :4742

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4742 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4742
netstat -ano | findstr :4742

From another machine

nmap -p 4742 -sV <host>
sudo nmap -sU -p 4742 <host>
nc -zv <host> 4742

Block it in the firewall

sudo ufw deny 4742/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4742" -Direction Inbound -LocalPort 4742 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4742 used for?

Port 4742 is assigned by IANA to sicct (SICCT), sicct-sdp (SICCT Service Discovery Protocol).

Is port 4742 TCP or UDP?

Port 4742 is registered for TCP and UDP.

Is it safe to open port 4742?

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 4742 is open?

On Linux run "ss -ltnup 'sport = :4742'", on macOS "lsof -nP -i :4742", and on Windows "netstat -ano | findstr :4742" to see the local process. From another machine, "nmap -p 4742 <host>" shows whether it is reachable.

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