swservers.com has no CNAME records.
Question and response
Question
dig swservers.com. NS
Answer
The response has no answer records.
Authority
swservers.com. 3 SOA dns.swservers.com. hostmaster.swservers.com. 1736564617 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0