A powerful client to manage and run port knocking sequences
About this app
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. • Quick Access: Utilize home screen shortcuts and a widget for immediate execution of configured sequences. • Customization: Adjust the interface with dynamic color themes (Android 12+), custom accents, and light/dark modes. Includes options for improved contrast. • Configuration Management: Export and import your knocking sequences for backup or transfer. • No Ads, Open Source: A free, transparent application focused on privacy and user control.
Licensed under Apache-2.0, by Alexander Yaburov.
What's New in v2.1.10
Imported from the F-Droid repository index.
- • New language localization: Ukrainian (credit to @varrkan82)
- • New language localization: Portuguese (credit to @ssantos)
Version history
Jun 11, 2026 · 8.1 MB · Android API 24–37 · code 370012200
Imported from the F-Droid repository index.
- • New language localization: Ukrainian (credit to @varrkan82)
- • New language localization: Portuguese (credit to @ssantos)
SHA-256 687c38eae29852e1544269be2816050aac8398ed08e8e08dc6a705f35df2592c
May 27, 2026 · 8.1 MB · Android API 24–36 · code 360011900
Imported from the F-Droid repository index.
- • New language localization: Spanish (credit to @Arquero)
- • Update app theme (fix #37)
SHA-256 95319b71aac1aaee3300696fcf5a65a3051a4d6b958aa9341264b6a14a81f0b7
May 10, 2026 · 8.1 MB · Android API 24–36 · code 360011400
Imported from the F-Droid repository index.
- • New language localization: Armenian (credit to @PazikLend)
SHA-256 83f104e8f79800c60944bee23f4e43e66eba22bd573ca2880f625c527462c69f
Will it run on your device?
92%
- Runs on a broad range of modern Android versions.
- Multiple CPU architectures are covered.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be me.impa.knockonports is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 2.1.9 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Knock on Ports first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Knock on Ports, and a listing is removed when the evidence for it stops holding up.
Get Knock on Ports
Every source we list for me.impa.knockonports is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
687c38eae29852e1544269be2816050aac8398ed08e8e08dc6a705f35df2592c
Signing certificate
168f6f6555a8438f8dac959eb886112e33e1beec22e910ebba62f3b8299f3a3f
Permissions Required
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
Report a problem with this listing
A listing is only as good as its corrections. If a source is broken, a signature looks wrong, or this app should not be here, tell the moderation team.