Port 3521

mc3ss · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicemc3ss
Registered2002-06

Frequently asked questions

What is port 3521 used for?

Port 3521 is registered with the IANA for mc3ss (TCP/UDP). Description: Telequip Labs MC3SS.

Is port 3521 a well-known port?

No. Port 3521 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 3521 is open?

Locally on Linux with ss -tulpn | grep ':3521\b', on Windows with netstat -ano | findstr :3521. To test a remote host use Test-NetConnection <host> -Port 3521 in PowerShell or nc -zv <host> 3521 on Linux/macOS.

How do I open port 3521 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 3521/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=3521/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 3521" -Direction Inbound -Protocol TCP -LocalPort 3521 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPmc3ssTelequip Labs MC3SS
UDPmc3ssTelequip Labs MC3SS

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