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Hey Moz Community! Looking for some input on a site migration. When redirecting some old pages that aren't going to be moved over to the new site, do you prefer to redirect to a homepage (or similar page) or to throw up a 404/410 on the new site? What have you found works best?

Does anybody know of a research tool that can track the amount of subdomains on a root domain? Maybe there is a way to manipulate a Google search to display the different subdomains that are indexed?