ns23.interactivedns.com has no CNAME records.
Question and response
Question
dig ns23.interactivedns.com. NS
Answer
The response has no answer records.
Authority
interactivedns.com. 87 SOA primary.interactivedns.com. nettigritty.nettigritty.com. 2026030400 3600 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0