37.3.255.128.in-addr.arpa.
Question and response
Question
dig dns-ext-itf-1.uiowa.edu. PTR
Answer
dns-ext-itf-1.uiowa.edu. 3600 PTR 37.3.255.128.in-addr.arpa.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0