us.confirmit.com has no NS records.
NS records for this zone are defined at confirmit.com.
NS records for this zone are defined at confirmit.com.
Question and response
Question
dig us.confirmit.com. NS
Answer
The response has no answer records.
Authority
confirmit.com. 86400 SOA udns1.cscdns.net. hostmaster.cscdns.net. 2018082969 10800 1800 1814400 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0