Are there any SSL certificates designed for hosters?

Question

Digital certificates

That is, so that all clients of the hosting provider are assigned one SSL certificate by default.
For example, Cloudflare puts SSL on everyone.

Answer 1

If you follow the path of least resistance, then only use third-party services.
Large CDN companies purchase an intermediate certificate in their name (certified by one of the large root certificate providers), which allows you to create an unlimited number of certificates. The cost of such a solution is suitable only for very large businesses.
It is the ability to issue your own certificates that allows you to reissue them to add new domains.
There is also a practice when a CDN provider enters into a partnership agreement with an SSL provider, which allows you to purchase certificates in bulk for symbolic pennies. So, in particular, does CloudFlare: it operates with a huge amount of Comodo PositiveSSL Multi-Domain.

Answer 2

There is. These are wildcard certificates.

Answer 3

If clients have their own domains (wildcard is for subdomains, and without www, that is, sub1.hoster.com, sub2.hoster.com, but not www.sub1.hoster.com), then something free and automatic like letsencrypt.

Answer 4

The certificate is issued for a domain, wildcart certificate - for several subdomains. If clients have different second-level domains, then you can't get by with one certificate. Either become a certificate reseller or use free Lets' Encrypt or StartCom certificates, for example.

Answer 5

any certificate seller sells certificates for many domains, for example, for a hundred, you just need to re-issue with the added domain after adding a new domain,
again, this solution is not for hosters, but more for cdn,
well, it’s quite expensive and you definitely can’t issue it to users for free, you
can try to issue certificates lets encrypt but there are also limits and not everything is so simple in the context of very mass hosting

Answer 6

No, one certificate "for all domains" cannot be obtained.
You can integrate with startssl and order certificates for each new domain.