erp_server.mirae.com has no CNAME records.
Question and response
Question
dig erp_server.mirae.com. NS
Answer
The response has no answer records.
Authority
mirae.com. 271 SOA mirae.com. root.mirae.com. 2017061401 3600 1200 864000 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0