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Exactly. The title "How to Download a List of All Registered Domain Names" is not correct.

For example in .com .net if a registrar puts a domain "on hold" that pulls it from the zone file. As such it will not appear in any zone file download. This is in fact a way for a company to keep a domain under wraps. As such:

register domain name (in .com )

pull the name servers

The name won't be in any zone file. And will be off the radar until it has nameservers or until someone guesses to see if it's been registered.

(Note other registries work differently (or the same) the above is specific to .com and .net)

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