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 It has mostly been replaced by IPP on port 631, but many printers still accept LPD for compatibility.
| Port number | 515 |
|---|---|
| Service | Line Printer Daemon |
| Protocol | TCP |
| Category | Printing |
| Default encryption | No |
Frequently asked questions
What is port 515 used for?
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 It has mostly been replaced by IPP on port 631, but many printers still accept LPD for compatibility.
Is port 515 TCP or UDP?
Port 515 (LPD) uses TCP.
Is port 515 secure?
Port 515 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 515 on my firewall?
Only if you specifically need LPD. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.