us.spf.supremebox.com has no CNAME records.
Question and response
Question
dig us.spf.supremebox.com. NS
Answer
The response has no answer records.
Authority
supremebox.com. 1158 SOA dns1.supremebox.com. hostmaster.supremebox.com. 1772473505 16384 2048 1048576 2560
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0