serverdev20.oxcyon.com has no CNAME records.
Question and response
Question
dig serverdev20.oxcyon.com. NS
Answer
The response has no answer records.
Authority
oxcyon.com. 277 SOA ns.rackspace.com. hostmaster.rackspace.com. 1771863725 3600 300 1814400 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0