Root zone
These servers manage the DNS root zone
all servers delegate to
in-addr.arpa.
These servers manage the in-addr.arpa zone
all servers delegate to
81.in-addr.arpa.
These servers manage the 81.in-addr.arpa zone
all servers delegate to
217.0.81.in-addr.arpa.
These servers manage the 217.0.81.in-addr.arpa zone