Based on our record, zonefiles.io seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
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 / about 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: over 2 years ago
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