50.4.155.90.in-addr.arpa.
Question and response
Question
dig 50.4.155.90.in-addr.arpa. PTR
Answer
50.4.155.90.in-addr.arpa. 300 PTR 50.4.155.90.in-addr.arpa.
Authority
4.155.90.in-addr.arpa. 3600 SOA auth.primary-dns.co.uk. support.aa.net.uk. 1773929813 10800 3600 1209600 600
Additional
50.4.155.90.in-addr.arpa. 3600 A 90.155.4.50
. 0 OPT ; payload 65000, xrcode 0, version 0, flags 0