Alexa now showing different ranks for sub-domains?

[-Raja-]

http://www.alexa.com/data/details/traffic_details/wordpress.com

http://www.alexa.com/data/details/traffic_details/wphacks.wordpress.com?q=


Something new that alexa is offering?

 

[shockie]

no alexa has always been doing that if a subdomain was being attributed to an appreciable amount of traffic. all subdomain traffic gets counted into a domain's total alexa rank, just as any directory/file with that domain.