Comodo's Positive Multiple Domain Wildcard SSL certificate can efficiently secure unlimited sub-domains under multiple domains. It's a simple SAN-enabled certificate with 99.9% browser ubiquity. It's also a wildcard SSL certificate and a perfect match for all e-commerce website, payment pages, etc. The package already includes three additional domain names with the purchase. It will save time and money by consolidating multiple sub-domains with just a single certificate.