Port 631

ipp and ipps · TCP/UDP

RangeSystem/well-known port (0–1023)
ProtocolTCP/UDP
Serviceipp and ipps
ReferenceRFC 8011
Registered2018-07-06
Modified2018-07-06

Frequently asked questions

What is port 631 used for?

Port 631 is registered with the IANA for ipp and ipps (TCP/UDP). Description: IPP (Internet Printing Protocol); Internet Printing Protocol over HTTPS.

Is port 631 a well-known port?

Yes. Port 631 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.

How do I check whether port 631 is open?

Locally on Linux with ss -tulpn | grep ':631\b', on Windows with netstat -ano | findstr :631. To test a remote host use Test-NetConnection <host> -Port 631 in PowerShell or nc -zv <host> 631 on Linux/macOS.

How do I open port 631 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 631/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=631/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 631" -Direction Inbound -Protocol TCP -LocalPort 631 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPippIPP (Internet Printing Protocol)
UDPippIPP (Internet Printing Protocol)
TCPippsInternet Printing Protocol over HTTPS

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