Command-line tool

knock

brew/knock

Checked 25 Oct 2026, 21:09 UTC · Listing refreshed from Homebrew, winget, npm, Scoop and cargo; npm packages checked against OSV.dev

Port-knock server

Website Source

At a glance

Type

Command-line tool

Install on

macOS, Linux

Last checked

25 Oct 2026, 21:09 UTC

Install it

macOS

brew install knock

Linux

brew install knock

Knock on ports using different protocols

knock hostname portnumber:protocol

Knock on port using UDP

knock -u hostname portnumber

Force usage of IPv4/IPv6

knock -4 hostname portnumber

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