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What level of domain name can I apply for a ssl certificate? Many people don't know much about it. Today, in order to let you know more about the conditions of ssl certificate application, I summarized the following contents. Let's look down together.

Ssl certificates can be bound to primary or secondary domain names.

There are two kinds of mainstream SSL that can bind multiple domain names:

1. Multi-domain type: a certificate is associated with several domain name registrations, which are generally different for domain name registration.

2. Wildcard: the certificate is associated with a first-level domain name, and all second-level domain names registered under this domain name can be applied.

A second-level domain name can apply for a certificate. For a single domain name certificate applied for for a primary domain name, there is no https data encryption for the second-level domain name. The wildcard certificate can maintain all second-level domain names registered under the primary domain name. The second-level domain name is equivalent to the same certificate as the primary domain name registration application.

General SSL certificates are not compatible with multiple domain name registrations. One SSL certificate is associated with one domain name registration. Entrust for the requirements of many customers for compatible multi-domain name registration, the world's exclusive agent issued a multi-domain SSL certificate (Multi-DomainSSLCertificate), in addition: a multi-domain SSL certificate can be used to encrypt the SSL security data of all domain name mailboxes on the same physics network server. Also known as UCC certificate or SANsssl certificate.

Expansion materials:

SSL certificates are divided into three categories, namely, dv certificate, ov certificate and ev certificate. In fact, according to the function of ssl certificate, it can be divided into single domain name registration certificate, multi-domain name registration certificate and wildcard certificate.

General dv certificate, ov certificate and ev certificate all belong to a single domain name registration certificate, that is to say, a ssl certificate can only encrypt the registration data of a domain name, and a secondary domain name cannot use a certificate. You can only apply for a certificate again. If there are many second-level domain names outside the primary domain name registration, it is necessary to choose a wildcard certificate.

First, a single domain name certificate matches one domain name registration. when you can only have one website and the URL does not have a second-level domain name, it is appropriate to buy a single domain name registration certificate. If it must be compatible with multiple domain name registration and pan-domain name binding, then you have to apply for multiple certificates.

In that way, there will be two difficult problems, one is that the application and management methods of each certificate need to be carried out one by one, which is time-consuming and laborious, and the other is the great increase in cost. At this time, you must have a multi-domain name registration certificate or a wildcard certificate.

Multi-domain name registration certificate means that a certificate is associated with several domain name registrations. this kind of domain name registration is generally different. This kind of certificate can be applied to the official website of enterprises with several station names, saving the inconvenience of processing one application and saving a lot of certificate costs.

A wildcard certificate is associated with a domain name registration, and all second-level domain names under this domain name registration can be applied. This applies to some e-commerce stations and some e-commerce stations as a second-level domain name in a big city. Such a URL must have a wildcard domain name certificate.

SSL certificate securely encrypts the website, which can effectively prevent hijacking, prevent your website from being maliciously implanted with advertisements, prevent tampering and monitoring from leaking users' passwords, and optimize the SEO ranking of search engines with SSL certificates.

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