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Blackhole server
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<p>Blackhole DNS servers are <a href="/facts/Domain_Name_System/rfxdWFsj">Domain Name System</a> (DNS) servers that return a "nonexistent address" answer to <a href="/facts/Reverse_DNS_lookup/b5qL5mN1">reverse DNS lookups</a> for addresses <a href="/facts/Reserved_IP_addresses/Kry30Gpl">reserved</a> for private use. </p>