ns2.srv.clusterdns.top has no NS records.
NS records for this zone are defined at clusterdns.top.
NS records for this zone are defined at clusterdns.top.
Question and response
Question
dig ns2.srv.clusterdns.top. NS
Answer
The response has no answer records.
Authority
clusterdns.top. 1800 SOA gwen.ns.cloudflare.com. dns.cloudflare.com. 2397946904 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0