filterb.waycom.net has no CNAME records.
Question and response
Question
dig filterb.waycom.net. NS
Answer
The response has no answer records.
Authority
waycom.net. 600 SOA ns1.waycom.net. noc.waycom.net. 2026020300 86400 7200 3600000 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0