Port 3821

pmcp · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicepmcp
Registered2004-11

Frequently asked questions

What is port 3821 used for?

Port 3821 is registered with the IANA for pmcp (TCP/UDP). Description: ATSC PMCP Standard.

Is port 3821 a well-known port?

No. Port 3821 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 3821 is open?

Locally on Linux with ss -tulpn | grep ':3821\b', on Windows with netstat -ano | findstr :3821. To test a remote host use Test-NetConnection <host> -Port 3821 in PowerShell or nc -zv <host> 3821 on Linux/macOS.

How do I open port 3821 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 3821/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=3821/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 3821" -Direction Inbound -Protocol TCP -LocalPort 3821 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPpmcpATSC PMCP Standard
UDPpmcpATSC PMCP Standard

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