Port 528
custix · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | custix |
| Modified | 2022-01-25 |
Frequently asked questions
What is port 528 used for?
Port 528 is registered with the IANA for custix (TCP/UDP). Description: Customer IXChange.
Is port 528 a well-known port?
Yes. Port 528 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.
How do I check whether port 528 is open?
Locally on Linux with ss -tulpn | grep ':528\b', on Windows with netstat -ano | findstr :528. To test a remote host use Test-NetConnection <host> -Port 528 in PowerShell or nc -zv <host> 528 on Linux/macOS.
How do I open port 528 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 528/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=528/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 528" -Direction Inbound -Protocol TCP -LocalPort 528 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | custix | Customer IXChange |
| UDP | custix | Customer IXChange |