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With the Open Site Explorer tool; Moz puts their powerful web crawler and index of over 85 Billion URLs in the palm of our hands. It is data already crawled that we may have access to whenever we want to perform our analyses.The feature that I want to show you now is called Domain Authority, and according to Moz.com Domain Authority represents Moz's best prediction for how a website will perform in search engine rankings.Moz calculates this metric by combining all of the other link metrics—linking root domains, number of total links, MozRank, MozTrust, etc.—into a single score.Over 40 signals are included in this calculation. This means your website's
Domain Authority score will often fluxuate. For this reason, it's best to use Domain Authority as a competitive metric against other sites as opposed to a historic measure of your internal SEO efforts. Domain Authority is scored on a100-point, logarithmic scale. (Taken from Moz.com)