mx1.sophos.com.
Question and response
Question
dig 131.128-28.62.219.195.in-addr.arpa. PTR
Answer
131.128-28.62.219.195.in-addr.arpa. 1800 PTR mx1.sophos.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0