scanner.pingtone.com has no CNAME records.
Question and response
Question
dig scanner.pingtone.com. NS
Answer
The response has no answer records.
Authority
pingtone.com. 680 SOA ns.pingtone.com. dnsmaster.pingtone.com. 1734668980 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0