Port 9 — discard / Wake-on-LAN
Quick reference for TCP/UDP port 9, used by discard / Wake-on-LAN. Includes what the service does, security guidance and related ports.
What is port 9?
Discard service; UDP/9 is also commonly used for Wake-on-LAN magic packets.
What port does discard / Wake-on-LAN use?
discard / Wake-on-LAN listens on port 9 by default.
Security guidance
Medium risk — open with care
Port 9 (discard / Wake-on-LAN) 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.
Frequently asked
What is port 9 used for?+
Port 9 is the standard TCP/UDP port for discard / Wake-on-LAN. Discard service; UDP/9 is also commonly used for Wake-on-LAN magic packets.
What port does discard / Wake-on-LAN use?+
discard / Wake-on-LAN listens on port 9 by default.
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