b.mosaico.email has no NS records.
NS records for this zone are defined at mosaico.email.
NS records for this zone are defined at mosaico.email.
Question and response
Question
dig b.mosaico.email. NS
Answer
The response has no answer records.
Authority
mosaico.email. 1800 SOA aria.ns.cloudflare.com. dns.cloudflare.com. 2398377362 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0