Port 631: IPP
Port 631 is the Internet Printing Protocol, the modern standard for sending print jobs and querying printer status over the network. CUPS, the print system used by Linux and macOS, runs its web interface and printing service on this port.
| Port number | 631 |
|---|---|
| Service | Internet Printing Protocol |
| Protocol | TCP/UDP |
| Category | Printing |
| Default encryption | No |
Frequently asked questions
What is port 631 used for?
Port 631 is the Internet Printing Protocol, the modern standard for sending print jobs and querying printer status over the network. CUPS, the print system used by Linux and macOS, runs its web interface and printing service on this port.
Is port 631 TCP or UDP?
Port 631 (IPP) uses TCP/UDP.
Is port 631 secure?
Port 631 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 631 on my firewall?
Only if you specifically need IPP. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.