ns1.ritternet.com has no CNAME records.
Question and response
Question
dig ns1.ritternet.com. NS
Answer
The response has no answer records.
Authority
ritternet.com. 193 SOA ns1.ritternet.com. hostmaster.ritternet.com. 2022102096 108 360 60 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0