ip4.bms.com has no CNAME records.
Question and response
Question
dig ip4.bms.com. NS
Answer
The response has no answer records.
Authority
bms.com. 166 SOA ns.bms.com. dnsadmin.bms.com. 2010104993 3600 600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0