Latest release · 7.0.0

UnetStack

The underwater network stack

Agent-based, with a network simulator built in. Design, simulate, test and deploy underwater acoustic networks.

Download community edition Read the handbook →

Underwater networks, from protocol stack to modems

UnetStack is a networking stack that extends communication networks underwater. Built on an agent-based framework, it covers design, simulation, testing and deployment, from the protocol stack to a software-defined acoustic modem.

01
Design
Compose agents and protocols on a media-agnostic stack.
02
Simulate
Run many-node networks in realistic channel conditions.
03
Test
Validate on real hardware with hardware-in-the-loop.
04
Deploy
Ship the same code to modems at sea. No porting.

What you build with

From desktop simulation to underwater network deployment with real modems.

PROTOCOL STACK

UnetStack & Agents

Read the handbook →
NETWORK SIMULATOR

UnetSim

About UnetSim →
CHANNEL SIMULATOR

Virtual Acoustic Ocean

View on GitHub →
DEVELOPMENT PLATFORM

UnetCube

About UnetCube →
CLOUD PLATFORM

UnetCloud

About UnetCloud →
HARDWARE

Subnero modems

Explore Subnero →

Inside the stack

An agent-based architecture, from hardware drivers and the Unet framework up through the network stack to applications and developer tools. All of it is reachable through a single set of APIs.

Read the UnetStack whitepaper (PDF) →
Capabilities across the stack
UnetStack capability groups arranged around the Unet logo: Communication & Networking, Positioning & Localization, Connectivity & Interoperability, Device & Platform Management, Sensing & Instrumentation (SWIS), Simulation & Development, UI/Dashboards/APIs, and Data Analytics
The layered stack
Shell
Web UI
UnetSocket APIs
Data Analytics
Remote Management
Network Stack
Communication Algorithms
Localization
Baseband Service
Device & Sensor Management
Unet framework + fjåge
Simulator
Subnero Modems
UnetCube
Third Party Modems
Satellite/RF
Optical Modem

Three editions, one codebase

The same core components ship for research, commercial deployment and OEM integration.

Community

Non-commercial use

Download now →

Commercial

Commercial use

Contact for licensing →

OEM

OEM licensing

Contact for licensing →

Download the community edition

UnetStack 7.0.0

Builds and simulates underwater networks on your own machine.

Size
20.9 MB (.tgz)
Platforms
macOS · Linux (x86_64) · Windows
Runtime
Java 8
Web UI
Chrome 61+ · Firefox 60+ · Safari 10.1+
Release notes
releasenotes.txt
Download .tgz

Downloading means accepting the .

Commercial use? Contact for licensing.

Older releases

All earlier community edition releases are available on GitHub Releases.

Terms of use

UnetStack community edition · version 7.0.0

Copyright © 2026, Acoustic Research Laboratory, National University of Singapore, and Subnero Pte Ltd. All rights reserved.

The UnetStack community edition software may be freely used for academic teaching and research purposes only. The software may NOT be used for any commercial activity, such as (but not limited to):

  • Commercial deployment of underwater networks.
  • Commercial demonstrations.
  • Commercial research.
  • Consulting work performed by academic students, faculty or research staff.
  • Training of commercial company employees.

This software is provided by the copyright holders and contributors “as is” and any express or implied warranties, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose are disclaimed. In no event shall the copyright holder or contributors be liable for any direct, indirect, incidental, special, exemplary, or consequential damages (including, but not limited to, procurement of substitute goods or services; loss of use, data, or profits; or business interruption) however caused and on any theory of liability, whether in contract, strict liability, or tort (including negligence or otherwise) arising in any way out of the use of this software, even if advised of the possibility of such damage.

For commercial licensing, please contact [email protected].

Download started

unet-community-7.0.0.tgz · 20.9 MB

Unpack it and start a simulated 2-node network:

tar xzf unet-community-7.0.0.tgz
cd unet-7.0.0
bin/unet samples/2-node-network.groovy

The simulation prints a web URL for each node — open them to get a command shell.

Read the handbook →

Accept & download .tgz

Documentation

Handbook, references and language APIs.

Underwater Networks Handbook

Read →

UnetStack Javadoc

Browse →

UnetStack APIs

Browse →

fjåge Javadoc

Browse →

fjåge developer's guide

Read →

Video tutorials

Watch →

Archived documentation

For projects still on UnetStack 3.

Handbook
UnetStack 3
Javadoc
3.0 3.1 3.2 3.3 3.4