133.58.19.105.in-addr.arpa.
Question and response
Question
dig email.sharenet.co.za. PTR
Answer
email.sharenet.co.za. 3600 PTR 133.58.19.105.in-addr.arpa.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0