mailto.stiels.de.
Question and response
Question
dig 51.48.137.5.217.in-addr.arpa. PTR
Answer
51.48.137.5.217.in-addr.arpa. 86400 PTR mailto.stiels.de.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0