mx3.bytedance.com has no CNAME records.
Question and response
Question
dig mx3.bytedance.com. NS
Answer
The response has no answer records.
Authority
bytedance.com. 85 SOA vip3.alidns.com. hostmaster.hichina.com. 2025121107 3600 1200 86400 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0