ns5.serverdata.net has no CNAME records.
Question and response
Question
dig ns5.serverdata.net. NS
Answer
The response has no answer records.
Authority
serverdata.net. 2295 SOA ns2.serverdata.net. hostmaster.serverdata.net. 2026022228 3600 1800 1814400 3601
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0