The B4CK.net service allows for accessing selected internal TCP services over the Internet. The service employs proxy hosts to traverse firewalls and NAT (network address translation) routers.
Publisher’s description
What is B4CK?
B4CK by Michał Trojnara is open-source Windows software. It is written in Go.
Installation and requirements
The publisher provides Portable installers for 64-bit, ARM64 and 32-bit Windows. It runs without installation (portable).
Project description on GitHub: “B4CK.net client”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Native ARM64 build for Windows on Arm
- Portable: runs without installation
Cons
- No update for more than a year
In short: B4CK is an open-source Windows tool for 64-bit, ARM64 and 32-bit PCs. Updates have slowed down.
Is B4CK safe to download?
- The file is served by b4ck.net, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
C5BB87F27B7FB96B853D49B45BF0786DFC91AB35815D8F95C7D81F85D27804F3· Open the VirusTotal report for this hash - The link answered when we last checked it (October 22, 2026)
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 1 versions ›| Version | Date | Size | Files |
|---|---|---|---|
| 1.0Latest | March 26, 2025 | — | 64-bit Portable32-bit PortableARM64 Portable |
Install from the command line
Silent install ›winget install --id B4CK.B4CK -eProgram files (.exe): b4ck.exe
Related guide: How to use winget: install and update apps
Information
- Publisher
- Michał Trojnara
- Licence
- GPL-3.0
- Price
- Free
- Source code
- github.com/mtrojnar/b4ck-client
- Written in
- Go
- Requires
- Windows 11 / 10
- Architecture
- 64-bit, ARM64, 32-bit
- Installer
- Portable
- Version
- 1.0
- Released
- March 26, 2025
- Added to the catalogue
- April 2, 2025
- Versions listed
- 1
- GitHub forks
- 1
- Website
- b4ck.net
- winget ID
- B4CK.B4CK
Ratings and reviews
No reviews yet. Be the first to rate it.
Frequently asked questions
Is B4CK free?
Yes. B4CK is open-source software under the GPL-3.0 licence.
Is B4CK safe to download?
The download comes from b4ck.net, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install B4CK with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Does B4CK run on ARM (Windows on Arm)?
Yes, there is a native ARM64 installer.
Can I use B4CK without administrator rights?
Yes, it is portable: unpack and run it.
