For example, suppose I want to list all third-level domains of google.com. That list should look like
translate.google.com
plus.google.com
etc. Is it possible to get that list for an arbitrary second-level domain?
Is it possible to list all third-level domains of the given second-level domain?
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1
In practice, no.
It may be possible for a specific domain, if the owner of the domain felt like it. Find the name servers for the domain in question (
dig ns google.com), then ask one of them for a zone transfer (dig axfr google.com @ns1.google.com) and see if you get a list of names or a short error message.