nutil2.infinitecom.net has no CNAME records.
Question and response
Question
dig nutil2.infinitecom.net. NS
Answer
The response has no answer records.
Authority
infinitecom.net. 180 SOA ns20.digicertdns.com. dns.digicertdns.com. 2009011505 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0