The OSINT Source Index

A working reference database of more than 1,800 institutional sources for open-source investigation, organised by country and by category: registries, courts, procurement portals, corporate filings, sanctions lists, maritime and aviation authorities, and the primary-source infrastructure investigators pivot through under deadline.

Every entry is signed and dated. The index is actively maintained, and corrections are applied on an ongoing basis. It is published as a free public resource under a dual MIT and CC BY 4.0 licence: use it, cite it, build on it.

The index is part of the Signal & Shadow reference architecture. Methods for working these sources are documented in the Methods series and the weekly Signal briefing.