# Knock on Ports (open-source utility app)

> 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.

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.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/impalex/knockonports |
| Platforms | Android |
| Built with | Kotlin |
| GitHub stars | 106 |
| License | Apache-2.0 (open source) |
| F-Droid | https://f-droid.org/packages/me.impa.knockonports/ (package me.impa.knockonports) |
| F-Droid anti-features | none flagged |
| Google Play | https://play.google.com/store/apps/details?id=me.impa.knockonports |
| App Store | not linked |
| Website | https://impalex.github.io/knockonports/ |
| Official | no |
| Category | Utilities |
| Latest release | 2.1.10 (Jun 10, 2026) |
| Last commit | Jul 4, 2026 |

F-Droid builds its apps from source and flags anti-features: https://f-droid.org/en/docs/Anti-Features/

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