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    Anonymous commented  · 

    Name server poisoning also happened occasionally on accident, due to responding accidently with an incremented query id, possibly poisoning some later random request. Also, if a DNS has DNS level blocking taking place, and it is treated like an authoritative DNS server in https://www.theemailshop.co.uk/secured-server-colocation/ it may 'black hole' your request. As in, send you an IP that is invalid and leads no where. This happened to google servers a while back when they accidentally had china servers listed as authoritative, which was causing global traffic to get black holed due to china censorship.

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