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Don't 'A' records only return IPv4 addresses?

Why do some websites return subdomains? How do they find those subdomains? I mean, are they doing normal subdomain bruteforcing then resolve each subdomain's A record?

Examples of those websites: DNSDumpster.com => Under 'A' Host Records section

and this one as well https://hackertarget.com/find-dns-host-records/

For example, when looking for uber.com, it returns the following list of subdomains: Example

Does that mean that it tries to match whatever entries having the string uber.com ocurence and returns its corresponding IPv4 address in the DNS server?

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The answer is in the pages for the links you posted.

Short answer: brute force & big data. Long answer: “The data we use to find host records here at hackertarget.com is sourced from a number of excellent projects as well as Internet search engines.”

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