ip-48-37.cdlan.net has no CNAME records.
Question and response
Question
dig ip-48-37.cdlan.net. NS
Answer
The response has no answer records.
Authority
cdlan.net. 600 SOA ns1.cdlan.net. mnt.cdlan.net. 3001347248 86400 3600 604800 6400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0