ns4.ebonenet.com has no CNAME records.
Question and response
Question
dig ns4.ebonenet.com. NS
Answer
The response has no answer records.
Authority
ebonenet.com. 2767 SOA ns1.ebonenet.com. noc.ebonenet.com. 2014131169 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0