us.dnsdocloud.com has no NS records.
NS records for this zone are defined at dnsdocloud.com.
NS records for this zone are defined at dnsdocloud.com.
Question and response
Question
dig us.dnsdocloud.com. NS
Answer
The response has no answer records.
Authority
dnsdocloud.com. 1800 SOA ns1.virtualns.net. dns.virtualname.net. 1771459200 14400 3600 1209600 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0