Wildcard certificate from Comodo.
http://www.positivessl.com/ssl-certificate-positivessl_wildcard.php
SSL Certificates · Wildcard
Get access to data on 11,206,397 websites that are Comodo PositiveSSL Wildcard Customers. We know of 1,689,991 live websites using Comodo PositiveSSL Wildcard and an additional 9,516,406 sites that used Comodo PositiveSSL Wildcard historically and 719,330 websites in the United States.
Get a list of 11,206,397 websites using Comodo PositiveSSL Wildcard which includes location information, hosting data, contact details, 1,689,991 currently live websites and an additional 440,713 domains that redirect to sites in this list. 9,516,406 sites that used this technology previously and 719,330 websites in the United States currently using Comodo PositiveSSL Wildcard.