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This is the first time I saw something like this happen.
Is there an explanation for this?
should (as for as I know) not exist to search engines.
If its a .COM/.EDU/.ORG/.NET then its trivial to pick up new domain registrations from so-called DNS zone file, with 24h delay. It gets harder with country specific domains like .CO.UK, but its only harder for small fish rather than giant sharks such as Google or Yahoo.
Either way there is no reason to feel sad about getting lots of traffic -- you must have content that is in demand! :)