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Our company owns a domain say www.mycompany.com. I understand that it is trivial to get an SSL certificate for above domain since we do have a website running on that address. We want a certificate for a subdomain say sub.mycompany.com. We intend to use this sub-domain in our organisation network only and have no plans to publish a public website on this subdomain.

So the question is "Is it necessary to have a DNS entry for subdomain, resolving to our IP address and host some page on that address?" I hope proving that main domain is in our control, we can get an SSL certificate for sub domain also. Is it possible?

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Why not get a wildcard SSL cert for mycompany.com so that you can set up SSL on it and any of its subdomains? – Kris Jan 5 '11 at 15:44
It is certainly an option but a wildcard certificate would be more expensive. – Hemant Jan 5 '11 at 16:27
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A certificate authority should not care whether or not you have a publically viewable HTTPS site for the common name you're requesting.

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