ndr.rocketseed.com has no CNAME records.
Question and response
Question
dig ndr.rocketseed.com. NS
Answer
The response has no answer records.
Authority
rocketseed.com. 416 SOA pdns05.domaincontrol.com. dns.jomax.net. 2026022301 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0