smtp-backup.knology.net has no NS records.
NS records for this zone are defined at knology.net.
NS records for this zone are defined at knology.net.
Question and response
Question
dig smtp-backup.knology.net. NS
Answer
The response has no answer records.
Authority
knology.net. 3600 SOA dns1.knology.net. npse-cloud-infrastructure-and-application-operations\@wowinc.com.knology.net. 2025081200 10800 3600 3600000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0