11/21/2025
* Official distribution sites for ION and ION-core have moved to GitHub:
https://github.com/nasa-jpl/ION-DTN
https://github.com/nasa-jpl/ion-core
* ION documentation:
https://ion-dtn.readthedocs.io/
Download link for new releases (after ION 4.1.2) is posted below. Please report all issues to GitHub. Submissions to this site will not be monitored.
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ION development is managed by the Jet Propulsion Lab.
The Interplanetary Overlay Network (ION) software distribution implements Delay-Tolerant Networking (DTN) architecture, as described in Internet RFC 9171. It is designed for use in embedded environments, including spacecraft flight computers and ground systems.
ION 4.1.3s is the last version to provide both BPv7 and v6.
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