spnet02.66.77.65.128.vocus.com has no CNAME records.
Question and response
Question
dig spnet02.66.77.65.128.vocus.com. NS
Answer
The response has no answer records.
Authority
vocus.com. 1800 SOA dom.ns.cloudflare.com. dns.cloudflare.com. 2395310550 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0