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A subdomain is basically a domain built on a domain – so, for instance, some sites might add a blog at blog.domain.com. An unassigned subdomain is a subdomain that hasn’t been set up and there will be an infinite number of them – e.g. NetworkSolutionsSucks.DomainBits.com, EvilNetworkSolutions.DomainBits.com, etc. What Network Solutions is doing is presenting a parking page any time someone goes to a nonexistent subdomain of a website hosted with them.
If these pages ended up getting indexed in Google or any of the other major search engines, it could cause some serious trouble for the website owners. Even if they don’t get indexed – how would you like your host to be adding pages to your website, without letting you know?
Network Solutions Sucks – avoid them like the plague!