ns13.zoneedit.com has no CNAME records.
Question and response
Question
dig ns13.zoneedit.com. NS
Answer
The response has no answer records.
Authority
zoneedit.com. 237 SOA dns1.easydns.com. zone.easydns.com. 1770138290 3600 600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0