nat0.fmt1.pfcs.com.
Question and response
Question
dig 21.subnet16.190.71.64.in-addr.arpa. PTR
Answer
21.subnet16.190.71.64.in-addr.arpa. 5 PTR nat0.fmt1.pfcs.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0