InstantSSL - General Frequently Asked Questions

Can I apply for a certificate for each sub-domain of the main domain?

Yes, but it can be simpler and more cost effective to open an account as an Enterprise Public Key Infrastructure Manager (EPKI Manager). For more information please contact info@jp.comodo.com.
It may also be more cost effective to use a Wildcard certificate which protects all sub-domains below the primary named domain. For more information please contact info@jp.comodo.com