All DNS zones on CZDS have the same format, and AFAIK all nTLDs are required to use it. But you're right for ccTLDs -- everyone uses their own format and most don't even allow you to get the zone file. There are some companies that provide similar lists from crawling data though (e.g. https://zonefiles.io/). - Source: Hacker News / almost 2 years ago
There are all kinds of ways Google could find out about your site. For many top-level domains, it's possible to just download a list of all domain registrations: https://zonefiles.io/. Source: about 2 years ago
Do you know an article comparing zonefiles.io to other products?
Suggest a link to a post with product alternatives.
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