ns3.ja.net has no CNAME records.
Question and response
Question
dig ns3.ja.net. NS
Answer
The response has no answer records.
Authority
ja.net. 3443 SOA ns0.ja.net. operations.ja.net. 2026022701 28800 3600 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0