DigiCert KnowledgeBase - Technical Support-hero

Knowledge Base

Supported domains for Private TLS/SSL certificates

Solution ID : GN110123022802
Last Modified : 10/21/2023

Use Private TLS/SSL certificates to secure private and public domains and IP addresses.

Domains you can secure with Private TLS/SSL certificates

  • Private IP addresses
    A private IP address is a range of non-internet-facing IP addresses. Private TLS/SSL certificates can secure private IPv4 and IPv6 addresses.
    • Private IPv4 addresses in the RFC 1918 range (e.g.,,
    • Private IPv6 addresses in the RFC 4193 range

  • Public IP addresses
    A public IP address is a globally routable IP address. Private TLS/SSL certificates can secure public IPv4 and IPv6 addresses.

  • Public domains (e.g., example.com)

  • Wildcard domains (e.g., *.example.com)
    Private TLS/SSL certificates can secure wildcard hostnames (e.g., *.example.com). However, you cannot secure the top-level wildcard domain (TLD) (e.g., *.com or *.org).

  • Internal server names
    An internal server name is a hostname that is not resolvable using the Public DNS. Private TLS/SSL certificates can secure any internal server name.
    • Server name with a non-public domain name suffix (e.g., example.local)
    • Short hostnames and NetBIOS names (e.g., localhost)
How would you rate this article?
Rate us:*
Thank you for your response.