spool.lnh.mail.rcn.net.
Question and response
Question
dig 207-172-157-181.in-addr.mail.rcn.net. PTR
Answer
207-172-157-181.in-addr.mail.rcn.net. 7200 PTR spool.lnh.mail.rcn.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0