b.iana-servers.net has no NS records.
NS records for this zone are defined at iana-servers.net.
NS records for this zone are defined at iana-servers.net.
Question and response
Question
dig b.iana-servers.net. NS
Answer
The response has no answer records.
Authority
iana-servers.net. 3600 SOA sns.dns.icann.org. noc.dns.icann.org. 2022092694 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0