I'd like to compare the traffic rank for some of the more popular sites in different categories.  If I search Alexa for webmasters.stackexchange.com, for example, the only result is all of Stack Exchange.  Similarly, if I try to search for answers.yahoo.com I get the results for all of Yahoo!.  How do you separate out a subdomain when searching for the traffic rank of a site?  I've tried manipulating the Alexa traffic stats URL with no luck.
How do I find the Alexa traffic rank of a site that uses a subdomain?
alexa
I don't think you'll be able to get a rank for a subdomain, Alexa groups subdomains together, the only stats visible by subdomain is the percentage of trafficfrom Stackexchange.com Site Info on Alexa:So you can determine your own subdomain site rank based off % traffic