dcv.digicert.com has no NS records.
NS records for this zone are defined at digicert.com.
NS records for this zone are defined at digicert.com.
Question and response
Question
dig dcv.dcvcheck.com. NS
Answer
The response has no answer records.
Authority
dcvcheck.com. 180 SOA ns10.digicertdns.com. dns.digicertdns.com. 2016727635 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0