ns1.firstdigital.com has no CNAME records.
Question and response
Question
dig ns1.firstdigital.com. NS
Answer
The response has no answer records.
Authority
firstdigital.com. 14 SOA ns1.firstdigital.com. technicalservice.firstdigital.com. 2026022001 3600 300 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0