ns1.rapidswitch.com has no CNAME records.
Question and response
Question
dig ns1.rapidswitch.com. NS
Answer
The response has no answer records.
Authority
rapidswitch.com. 7713 SOA ns2.rapidswitch.com. hostmaster.rapidswitch.com. 98 3600 120 1209600 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0