Port 515 — LPD
Quick reference for TCP/UDP port 515, used by LPD. Includes what the service does, security guidance and related ports.
What is port 515?
Line Printer Daemon protocol.
What port does LPD use?
LPD listens on port 515 by default.
Is port 515 open? How to check
Run one of these from your computer, replacing HOST with the IP address or domain you want to test.
nc -zv HOST 515
Test-NetConnection HOST -Port 515
nmap -p 515 HOST
A refused or timed-out connection means the port is closed or filtered by a firewall.
Security guidance
Medium risk — open with care
Port 515 (LPD) can safely face the internet if you keep the software up to date, restrict admin endpoints, and use TLS where possible. Audit who can reach it and watch your logs.
Related ports
Frequently asked
What is port 515 used for?+
Port 515 is the standard TCP/UDP port for LPD. Line Printer Daemon protocol.
What port does LPD use?+
LPD listens on port 515 by default.
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