[zjgreen]

Seems to be a fraction of the coverage other aggregator sites have (i.e. https://www.adauth.com)

[aarreedd]

You're right. We are planning to load all domains in Common Crawl soon. For now we only have domains in Alexa top 1M and other similar lists.

You can submit domains (https://www.adstxt.com/submit-domain) or email a list to support [at] adstxt.com and we will add them to our index.