subdomain hosting????

What do you mean by "host someone else's subdomain"? For example, you have you.blogspot.com and you want to host it somewhere else? In order to hose the subdomain somewhere, you need to have access to the DNS records for the domain and make the modifications. This means you will need to have access to DNS zone records of "blogspot.com" to point "you.blogspot.com" to the new host.