ns4.subrigo.net has no CNAME records.
Question and response
Question
dig ns4.subrigo.net. NS
Answer
The response has no answer records.
Authority
subrigo.net. 3600 SOA ns1.subrigo.net. support.cloudns.net. 2026021301 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0