esa3.hc1394-54.c3s2.iphmx.com.
Question and response
Question
dig 55.37.138.139.in-addr.arpa.c3s2.iphmx.com. PTR
Answer
55.37.138.139.in-addr.arpa.c3s2.iphmx.com. 3600 PTR esa3.hc1394-54.c3s2.iphmx.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0