ns20.digicertdns.com has no NS records.
NS records for this zone are defined at digicertdns.com.
NS records for this zone are defined at digicertdns.com.
Question and response
Question
dig ns20.digicertdns.com. NS
Answer
The response has no answer records.
Authority
digicertdns.com. 180 SOA ns10.dnsmadeeasy.com. dns.dnsmadeeasy.com. 2009010148 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0