Port 8991

https-wmap · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicehttps-wmap
Registered2007-12-03

Frequently asked questions

What is port 8991 used for?

Port 8991 is registered with the IANA for https-wmap (TCP/UDP). Description: webmail HTTPS service.

Is port 8991 a well-known port?

No. Port 8991 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 8991 is open?

Locally on Linux with ss -tulpn | grep ':8991\b', on Windows with netstat -ano | findstr :8991. To test a remote host use Test-NetConnection <host> -Port 8991 in PowerShell or nc -zv <host> 8991 on Linux/macOS.

How do I open port 8991 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 8991/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=8991/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 8991" -Direction Inbound -Protocol TCP -LocalPort 8991 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPhttps-wmapwebmail HTTPS service
UDPhttps-wmapwebmail HTTPS service

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