Blackhole DNS servers are Domain Name System (DNS) servers that return a "nonexistent address" answer to reverse DNS lookups for addresses reserved for private use. == Background == There are several ranges of network addresses reserved for use on private networks in IPv4: Reverse DNS queries are used to map IP addresses to domain names.
Blackhole DNS servers are Domain Name System (DNS) servers that return a "nonexistent address" answer to reverse DNS lookups for addresses reserved for private use. == Background == There are several ranges of network addresses reserved for use on private networks in IPv4: Reverse DNS queries are used to map IP addresses to domain names.
Source: Wikipedia "Blackhole server" · CC BY-SA 4.0
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