smtp.toppcrews.nttpc.co.jp.
Question and response
Question
dig 86.64.214.137.163.in-addr.arpa. PTR
Answer
86.64.214.137.163.in-addr.arpa. 86400 PTR smtp.toppcrews.nttpc.co.jp.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0