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Each and every Multi-Domain certificate featured on this page is a seal of quality in and of itself. It's always worth reiterating that all modern SSL comes with standard 256-bit encryption and that it's the extra features, support, and brand recognition that lead to a higher price.
Over the next couple of sections, we'll explain what Multi-Domain SAN is and why it might be useful for you to secure multiple domains, too. If you feel confident in your knowledge, and if you know for a fact that you need a Multi-Domain SAN SSL, however, then you may wish to scroll down to certificate descriptions, instead.
Now, it's worth pointing out that a Multi-Domain SSL isn't qualitatively different from any other kind of SSL certificate. Multi-Domain SSL still features the same encryption standards as a regular EV SSL, for example, and it's still going to protect any website from common data theft practices. The difference, instead, lies in coverage.
Specifically, a Multi-Domain SSL certificate uses the Subject Alternative Name protocol to extend its reach to domains that might be adjacent to your main domain. These are not subdomains, mind. A Multi-Domain SSL certificate will simply cover multiple domains that exist within the purview of your main domain. Therefore, a regular Multi-Domain SSL will not provide extended coverage to unlimited subdomains: you'll need to get a Wildcard SSL certificate for that functionality (Multi-Domain Wildcard SSL exists, read more about it below).
Depending on how your specific Multi-Domain SSL is set up, your Subject Alternative Names might include as many as a dozen different SAN items for the DNS to resolve. Multi-Domain SSL is an easy and foolproof way to get all of your domain names in order without spending more than you need to.
Though most users are unlikely to have problems with it, the upper limit of SAN instances supported by any different Multi-Domain SAN SSL Certificate is between 250 to 500 - a hard cap. Something to keep in mind, if you intend to add more of them after the initial setup.
Using a Multi-Domain SSL Certificate - What is it for?
Multi-Domain SAN is often put to work on Microsoft Exchange Servers, Office Communications Servers, Mobile Device Managers, and regular multi-domain websites and intranet setups. In effect, you could use a SAN certificate to secure all domains attached to specific IP addresses. Further still, if you opt for a Wildcard Multi-Domain certificate, you can secure all of your domains and subdomains in one go.
The goal, then, is to simplify certificate maintenance without skimping on website security. If you opt for a Multi-Domain SSL certificate - even a Wildcard - you're still getting all the amenities you need to protect your web presence. It's just that a fully qualified Certificate Authority will give you one certificate to use across the board, rather than getting one SSL for each of your IP addresses or domains.
These SSL certificates aren't necessarily expensive, either. In fact, Multi-Domain SSL is often the most cost-effective way to secure multiple domains. Though, your mileage may vary depending on which Certificate Authority you end up choosing.
Your most important takeaway here should be that Multi-Domain SAN certificates are perfect for when you need to secure multiple websites, but don't want to have to manage multiple separate certificates. One SSL certificate can handle all of that, and then some.