Port 5318

pkix-cmc · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicepkix-cmc
ReferenceRFC 10003
Modified2026-02-13

Frequently asked questions

What is port 5318 used for?

Port 5318 is registered with the IANA for pkix-cmc (TCP/UDP). Description: PKIX Certificate Management using CMS (CMC); Reserved.

Is port 5318 a well-known port?

No. Port 5318 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 5318 is open?

Locally on Linux with ss -tulpn | grep ':5318\b', on Windows with netstat -ano | findstr :5318. To test a remote host use Test-NetConnection <host> -Port 5318 in PowerShell or nc -zv <host> 5318 on Linux/macOS.

How do I open port 5318 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 5318/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=5318/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 5318" -Direction Inbound -Protocol TCP -LocalPort 5318 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPpkix-cmcPKIX Certificate Management using CMS (CMC)
UDP–Reserved

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