Port 3511

webmail-2 · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicewebmail-2
Registered2002-05

Frequently asked questions

What is port 3511 used for?

Port 3511 is registered with the IANA for webmail-2 (TCP/UDP). Description: WebMail/2.

Is port 3511 a well-known port?

No. Port 3511 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 3511 is open?

Locally on Linux with ss -tulpn | grep ':3511\b', on Windows with netstat -ano | findstr :3511. To test a remote host use Test-NetConnection <host> -Port 3511 in PowerShell or nc -zv <host> 3511 on Linux/macOS.

How do I open port 3511 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 3511/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=3511/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 3511" -Direction Inbound -Protocol TCP -LocalPort 3511 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPwebmail-2WebMail/2
UDPwebmail-2WebMail/2

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