ns5.netvigator.com has no CNAME records.
Question and response
Question
dig ns5.netvigator.com. NS
Answer
The response has no answer records.
Authority
netvigator.com. 1613 SOA ns5.netvigator.com. dnsadmin.netvigator.com. 2026022401 10800 3600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0