IT Technology: SSL Certificates for Internal Server Names

An internal name is a domain or IP address that is part of a private network. Common examples of internal names are:

• Any server name with a non-public domain name suffix. For example, www.contoso.local or server1.contoso.internal.
• NetBIOS names or short hostnames, anything without a public domain. For example, Web1, ExchCAS1, or Frodo.
• Any IPv4 address in the RFC 1918 range.
• Any IPv6 address in the RFC 4193 range.

You may get the SSL certificates for your internal server names from any Certificate Authorities ( CAs ) - GlobalSign, DigiCert, etc. However, Certificate Authorities (CAs) must immediately begin to phase out the issuance of SSL Certificates for internal server names or reserved IP addresses and eliminate (revoke) any certificates containing internal names by October 2016.


Reference:
SSL Certificates for Internal Server Names
https://www.digicert.com/internal-names.htm