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Does anyone know how to find out whether an available name has been registered at all at some point in the past? (Even if only for a few days.) And, if so, is it possible to find out how long it was registered for?
you could go to archive.org and type the domain name in. that would at least show you if there was ever a site hosted at the domain. Not 100% though as some sites never got crawled by archive.org
I have seen a few domains I've done a whois on there and found to be available that it has been registered in the past and they have cached whois information going back years.