Port 5420

cylink-c · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicecylink-c

Frequently asked questions

What is port 5420 used for?

Port 5420 is registered with the IANA for cylink-c (TCP/UDP). Description: Cylink-C.

Is port 5420 a well-known port?

No. Port 5420 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 5420 is open?

Locally on Linux with ss -tulpn | grep ':5420\b', on Windows with netstat -ano | findstr :5420. To test a remote host use Test-NetConnection <host> -Port 5420 in PowerShell or nc -zv <host> 5420 on Linux/macOS.

How do I open port 5420 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 5420/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=5420/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 5420" -Direction Inbound -Protocol TCP -LocalPort 5420 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPcylink-cCylink-C
UDPcylink-cCylink-C

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