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This is related to a question I saw here where the OP asks whether you can point an A record to a private IP address. So it seems like you can but I have a further question...

If I create the subdomain private on mydomain.com and point this to the private ip address 10.10.1.234, can I then use my wildcard SSL certificate for *.mydomain.com so that https://private.mydomain.com has a proper/valid certificate for internal clients?

Hope this makes sense

Tommiie
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wingyip
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1 Answers1

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There is no difference between private (RFC1918) and public IP addresses except that the former are not routable on the Internet and the latter are.

Your DNS zones can point to both these private and public IP addresses as to the DNS — and to routers and other devices — there is no difference between private and public IP addresses. Your SSL/TLS certificates aren't concerned with IP addresses at all and only care about DNS names. Your certificate is valid if it is signed and you use it on the correct website.

Thus to answer your question, your wildcard certificate will work and be valid as it is a wild card certificate for your domain. The IP address pointed to by the A record is of no significance.

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Tommiie
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