单域名SSL证书可以保护一个域名，可以是顶级域名（默认带www和不带www）也可以是二级域名，例如：www.certbase.com申请单域名SSL证书, 则 certbase.com也可以被保护。如果您为app.certbase.com申请的，则只能保护这一个。
单域名SSL证书有三种验证等级： DV SSL证书（域名验证）、OV SSL证书（组织验证）和EV SSL证书（扩展验证）。
Get it quick! No paperwork required. Issued in minutes.
Get it fast! You can have DV in under 10-minutes，OV/EV under 2 days
Your certificates will work for the www and non-www versions of your website.
Each certificate includes a clickable trust seal ensuring customer trust.
You don't need to provide any business docs for any type of certificate.
Install your certificate on any number of physical servers. There's no limit.
Rest assured with limited certificate warranties. You're covered!
We're celebrating over 6 years of stellar support! Your choice of phone, chat, and email support.
Fully supported in all major mobile devices and platforms.
Easily start over with a fresh certificate at any time. It's free.
Buy it, install it and try it out. Cancel for any reason within 30-days of issuance for a full 100% refund.
DV certificates can be issued in just minutes. OV/EV in 2 days. Buy it today, get it today.
Certs only require you to demonstrate proof of domain-control by email, DNS, or file authentication, validation team will help you get all done.