Yes, you can run it without your cl cname. a CNAME is a canonical name or an alias or a nickname. Hence, connecting to cl.darkice.blast is the exact same thing as connecting to client.darkice.blast. People mostly use it for virtual hosts. For example, if you have www.example.com
, ftp.example.com and webmail.example.com, all being hosted on the same IP address then you can create CNAME's for all of them but one.