http://y7egb5vi45k74makeixpfb7jnimfxm3gf233lb3ke2ldonozjk55nvad.onion/notes_on_dns.html
Our dig invocation now is to our caching name
server, and we request the PTR record. Note the format of the request
has the IP address backward reflecting the structure
“arpa->in-addr->107->161->19->243” or essentially a tree
like structure traversed most significant octet first, allowing us to
group IP address by All 107.X.X.X (107.0.0.0/8) into a zone rather than
all IP address that end...