Knock on Ports
Knock on Ports is a free, open-source utility app for Android. A powerful client to manage and run port knocking sequences. It has 106 GitHub stars and is released under the Apache-2.0 license, and you can install it from F-Droid and Google Play.
About Knock on Ports
A utility for executing port knocking sequences to discreetly open access to services protected by firewalls. Configure custom sequences using UDP, TCP, or ICMP packets with support for both IPv4 and IPv6. Key Features: • Protocol Flexibility: Create sequences with UDP, TCP, or ICMP packets. Fine-tune parameters including destination ports, inter-packet delays, TTL, Hop Limit, and packet payload data. • Automation & Integration: Automatically launch applications (e.g., SSH clients) or open URLs upon a successful knock. Supports integration with other tools via a custom URI scheme for advanced automation. • Dual-Stack Support: Full compatibility with IPv4 and IPv6 networks.
Privacy and F-Droid
F-Droid builds Knock on Ports from its published source code and flags anti-features such as ads, tracking or reliance on non-free services.
No anti-features flagged on the latest F-Droid build.
Screenshots
Screenshots from the app's F-Droid listing.
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What is Knock on Ports?
Knock on Ports is a free, open-source utility app for Android. A powerful client to manage and run port knocking sequences. It has 106 GitHub stars and is released under the Apache-2.0 license, and you can install it from F-Droid and Google Play.
Is Knock on Ports free and open source?
Yes. Knock on Ports's source code is public on GitHub under the Apache-2.0 license, which is OSI-approved or FSF-free. F-Droid, which builds it from source, flags no anti-features such as ads or tracking on its latest build.
How do I install Knock on Ports?
You can install Knock on Ports from F-Droid (package me.impa.knockonports) and from Google Play; the links are on this page. Its GitHub repository also publishes releases (latest: 2.1.10).
Is Knock on Ports still maintained?
The repository's most recent commit was on Jul 4, 2026. Its F-Droid listing was last updated on Jun 11, 2026. appsgit only lists apps whose repository had a commit in the last six months.