Of Course Real!!!
Because AlexaRank is calculated using the Alexa Toolbar. Alexa takes the browsing data from the millions of people using the Toolbar and calculates the traffic ranking of each site. As Alexa states, while low traffic sites are harder to gauge accurately, once a site reaches a 100,000 or less ranking the accuracy of the measure increases. Hence if you can top a 10,000 AlexaRank, or even 1000, the credibility of that ranking is increased.