ns1.spf.dnssmarthost.net has no CNAME records.
Question and response
Question
dig ns1.spf.dnssmarthost.net. NS
Answer
The response has no answer records.
Authority
spf.dnssmarthost.net. 6123 SOA ns1.spf.dnssmarthost.net. admins.siteground.com. 9125022 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0