_netblocksc26.carrierzone.com has no NS records.
NS records for this zone are defined at carrierzone.com.
NS records for this zone are defined at carrierzone.com.
Question and response
Question
dig _netblocksc26.carrierzone.com. NS
Answer
The response has no answer records.
Authority
carrierzone.com. 1200 SOA ns1.carrierzone.com. admin.carrierzone.com. 2017082775 86400 3600 3600000 345600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0