1. AdGuard DNS — ad-blocking DNS server. https://adguard-dns.io/en/public-dns.html
2. Alexa top 1m domains list. https://s3.amazonaws.com/alexa-static/top-1m.csv.zip
3. BuiltWith top 1m rank. https://builtwith.com/top-1m
4. CIDR report. https://www.cidr-report.org/as2.0/
5. Cisco umbrella top 1m domains list. https://www.trisul.org/devzone/doku.php/cisco_umbrella_top-1m_domains_list