dns4.bigrock.in has no NS records.
NS records for this zone are defined at bigrock.in.
NS records for this zone are defined at bigrock.in.
Question and response
Question
dig dns4.bigrock.in. NS
Answer
The response has no answer records.
Authority
bigrock.in. 1800 SOA andy.ns.cloudflare.com. dns.cloudflare.com. 2399391549 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0