You can secure multiple subdomains by purchasing a Wildcard Certificate. This SSL was specifically designed for ensuring the security of your main domain, along with its multiple subdomains. For instance, if your site’s domain is ssldragon.com, then the Wildcard certificate for *.ssldragon.com will secure an unlimited number of your first-level subdomains like mail.ssldragon.com, account.ssldragon.com or login.ssldragon.com.
You can find our full list of Wildcard certificates at this link.
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