For install wordpress MU (with automate subdomain feature) I need wildcard DNS setup and host, Here's how
WILDCARD DNS
A wildcard DNS record is a record in a DNS Zone that will match requests for non-existent domain names. A wildcard DNS record is specified by using a "*" as the left most label (part) of a domain name, e.g. *.example.com.
For Godaddy Host, We must pay 2 USD/ month and only primary domain can use this setting.
For Hostgator, No need to pay. And We could use it with all domain (Primary – add on domain)
Note : If you register domain with godaddy and point ip to hostgator hosting. It's important to know Wildcard DNS will not working. You should change DNS to use Hostgator DNS first.
How to set it up:
1.Log in to control panel, Go to "subdomain" section
2.Create subdomain by use "*" and point it to website root.
