Port 3905

mupdate · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicemupdate
ReferenceRFC 3656

Frequently asked questions

What is port 3905 used for?

Port 3905 is registered with the IANA for mupdate (TCP/UDP). Description: Mailbox Update (MUPDATE) protocol.

Is port 3905 a well-known port?

No. Port 3905 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 3905 is open?

Locally on Linux with ss -tulpn | grep ':3905\b', on Windows with netstat -ano | findstr :3905. To test a remote host use Test-NetConnection <host> -Port 3905 in PowerShell or nc -zv <host> 3905 on Linux/macOS.

How do I open port 3905 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 3905/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=3905/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 3905" -Direction Inbound -Protocol TCP -LocalPort 3905 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPmupdateMailbox Update (MUPDATE) protocol
UDPmupdateMailbox Update (MUPDATE) protocol

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