mail2.voip.cableone.net has no NS records.
NS records for this zone are defined at voip.cableone.net.
NS records for this zone are defined at voip.cableone.net.
Question and response
Question
dig mail2.voip.cableone.net. NS
Answer
The response has no answer records.
Authority
voip.cableone.net. 900 SOA ns1.cableone.net. dnsadmin.cableone.net. 381 10800 3600 2592000 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0