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> (i.e. not RFC1918 space)

Is this just a restriction on current CAs? I have a self-signed certificate on my router (more out of curiosity than any practical benefit), and it comes up fine on https://192.168.1.1/

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Yes, this restriction applies only to public CAs. The purpose is to prevent someone from getting, for example, a 192.168.1.1 cert and then using it on another network in a mitm attack.

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