Learn more about the program

Learn about the program, how it operates, and where to find additional information.

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The Site Scanning program builds on a series of earlier projects to offer real-time, automatic data about all federal websites. It begins by taking the .gov registry export and joins several additional data sources to aggregate a list of subdomains within those domains. The result is approximately 25,000 websites on 1,200 domains.

The system then runs a series of scans against the complete list of websites daily, making the results available as open data. While many users want the data in a spreadsheet or machine-readable file, we’ve also created an API that allows interactive access to the data.

To learn more about this program, be sure to check out the documentation repository. To get in touch with the team, file an issue or email us at site-scanning@gsa.gov.