spf.webapps.net has no CNAME records.
Question and response
Question
dig spf.webapps.net. NS
Answer
The response has no answer records.
Authority
webapps.net. 818 SOA ns1.register.it. hostmaster.register.it. 2026021801 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0