205.158.110.0.ptr.us.xo.net has no NS records.
NS records for this zone are defined at xo.net.
NS records for this zone are defined at xo.net.
Question and response
Question
dig 205.158.110.0.ptr.us.xo.net. NS
Answer
The response has no answer records.
Authority
xo.net. 900 SOA ns-twbg.verizonwireless.com. ipadmin.eng.xo.com. 2006052819 1800 600 604800 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0