dynamically generating subdomains using subdomain-fu

hi,

I am using subdomain-fu for creating subdomains . My doubt is how can we give the subdomains in the etc/hosts ,when the sub-domains are dynamicallybeing created.

Ex: i created a subdomain called "user1" and i specified this in etc/ hosts file.So eveery time i cant specify the subdomain which is being created.So can i ovecome this problem.