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This is a tool that uses retrieves Moz.com data (E.g. page and domain authority) for URLs on bulk. It's useful if you have a large number of links and need to check them all to see which ones are the most authoritative.
You need to register to use the tool because Moz.com limit the number of links we can check per second and per month. Having user accounts helps us prevent excessive users and also improve the quality of the service for everyone.