Apple serves a JSON file containing a list of 250,000 domains at the https://cdn.smoot.apple.com/static/autofill_tld_whitelist_url endpoint. This list appears to be used by the Safari web browser to auto-complete domains typed into the address bar.
This repository is automated with a GitHub action that polls the endpoint hourly, saves the response to ./autofill_tld_whitelist_url.json, commits any changes, and updates the badges in the README. You can click on the last change badge to see a diff.