firebrick-internal.grinton.net.
Question and response
Question
dig 129.128-255.203.187.81.in-addr.arpa. PTR
Answer
129.128-255.203.187.81.in-addr.arpa. 38400 PTR firebrick-internal.grinton.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0