The Arpanet Reconstruction Project is an interactive recreation of the ARPANET as it existed around 1972–1973, featuring replicas of historical computers running recovered software and interconnected through simulated Interface Message Processors (IMPs) with their original firmware. The project aims to allow users to experience and explore the early ARPANET, including the ability to interact with nodes as they were during this formative period in networking history.
Users can engage with the reconstructed network by accessing live terminals that emulate period-appropriate hardware, such as Teletype machines and DEC VT05 terminals, complete with audio simulation and virtual paper output. The platform also offers a map of the 1973 ARPANET, where nodes are color-coded to indicate their accessibility within the reconstruction. Some nodes are fully accessible, while others are planned for future addition as the project progresses.
A notable feature is the ability for participants to bring their own replica IMPs online, connecting devices such as PiDP-10 or PiDP-11/8/1 replicas, or even Linux machines, to the reconstructed network through provided 'leased line' sockets. The project supports the use of various terminal emulators, including VT-100, VT-52, Datapoint, IMLAC, and Tektronix, and even allows connection of real serial terminals for an authentic experience. The platform encourages users to relive historical scenarios, such as those presented at the 1972 ICCC convention, by following step-by-step instructions to interact with different Arpanet nodes as attendees once did.
The Arpanet Reconstruction Project is a work in progress, with ongoing efforts to expand the number of reconstructed nodes and enhance the authenticity of the experience. It is designed for individuals interested in the history of networking, providing an educational and immersive way to understand the origins and operation of the early ARPANET.
Arpanet Reconstruction Project is an Other dev tools product. Enabling users to simulate and explore the historical ARPANET network environment for educational and research purposes. Arpanet Reconstruction Project is an open-source project aimed at network researchers. The project is open source (Open Source). The product ships for the command line.
Arpanet Reconstruction Project first shipped in 2026. The project is developed in the open on GitHub with 19 stars and 2 commits in the last 90 days. Among its 5 catalogued features are network simulation, historical nodes, and interactive map.
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