postbox.xpd.se.
Question and response
Question
dig 227.192-26.106.75.217.in-addr.arpa. PTR
Answer
227.192-26.106.75.217.in-addr.arpa. 5 PTR postbox.xpd.se.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0