mx.npr-europe.com.
Question and response
Question
dig 117.124.253.145.in-addr.arpa. PTR
Answer
117.124.253.145.in-addr.arpa. 43200 PTR mx.npr-europe.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1460, xrcode 0, version 0, flags 0