Port 4742
sicct and sicct-sdp · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | sicct and sicct-sdp |
| Registered | 2006-04 |
Frequently asked questions
What is port 4742 used for?
Port 4742 is registered with the IANA for sicct and sicct-sdp (TCP/UDP). Description: SICCT; SICCT Service Discovery Protocol.
Is port 4742 a well-known port?
No. Port 4742 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 4742 is open?
Locally on Linux with ss -tulpn | grep ':4742\b', on Windows with netstat -ano | findstr :4742. To test a remote host use Test-NetConnection <host> -Port 4742 in PowerShell or nc -zv <host> 4742 on Linux/macOS.
How do I open port 4742 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 4742/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4742/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4742" -Direction Inbound -Protocol TCP -LocalPort 4742 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | sicct | SICCT |
| UDP | sicct-sdp | SICCT Service Discovery Protocol |