mail.hostcolor.net has no CNAME records.
Question and response
Question
dig mail.hostcolor.net. NS
Answer
The response has no answer records.
Authority
hostcolor.net. 10800 SOA nsc1.hostcolor.us. monitoring.hostcolor.com. 2024061801 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0