1 million domains ranked by Alexa: http://s3.amazonaws.com/alexa-static/top-1m.csv.zip

For more try https://commoncrawl.org/

Or ... you could use the methods listed in the article.

See also: https://www.premiumdrops.com/zones.html

They have some pretty good zone files for major TLDs.

Maybe the DNS ANY or reverse DNS datasets on scans.io? (the former, I presume, ultimately covering more domain names but containing more extraneous information)

You can apply for Zone File access at some Internet registries.