mail2.cellhire.net has no CNAME records.
Question and response
Question
dig mail2.cellhire.net. NS
Answer
The response has no answer records.
Authority
cellhire.net. 10800 SOA ns1.eurodns.com. hostmaster.eurodns.com. 2025112100 43200 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0