Printing ports
3 printing ports: what each one does, its protocol, and whether it is secure by default.
SubnetKit lists 3 printing ports, using TCP and TCP/UDP. 3 of 3 are formally registered with IANA rather than just a widely followed convention.
None of the printing ports here are encrypted by default. Treat traffic on any of them as plain text unless you add TLS, SSH, or a VPN tunnel yourself.
Click any port below for its full page: what it does, its protocol, and whether it is safe to expose.
| Port | Service | Protocol | What it does |
|---|---|---|---|
| 515 | LPD | TCP | Line Printer Daemon |
| 631 | IPP | TCP/UDP | Internet Printing Protocol |
| 9100 | JetDirect | TCP | Raw / HP JetDirect printing |
Frequently asked questions
Which ports are in the Printing category?
port 515 (LPD), port 631 (IPP) and port 9100 (JetDirect).
How many printing ports does SubnetKit list?
3, covering TCP and TCP/UDP. 3 of them are formally registered with IANA.
Are printing ports secure by default?
No. None of the printing ports here are encrypted by default; wrap them in TLS, SSH, or a VPN if you need to protect the traffic.
Which printing port has the lowest number?
Port 515 (LPD). Port 515 is the Line Printer Daemon protocol, the classic Unix printing system that queues and forwards print jobs to a printer or print server. It has mostly been replaced by IPP on port 631, but many printers still accept LPD for compatibility.