interserver-smtp-in.j.is.cc has no NS records.
NS records for this zone are defined at is.cc.
NS records for this zone are defined at is.cc.
Question and response
Question
dig interserver-smtp-in.j.is.cc. NS
Answer
The response has no answer records.
Authority
is.cc. 1800 SOA josh.ns.cloudflare.com. dns.cloudflare.com. 2398920840 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0