It is not possible to block someone from subscribing, nor to block them from viewing your blog. Even if it was, all they would have to do is go to a wi-fi hot spot and use a different email address.
You can set it up so that, if they use the same email address and username, their comments are sent directly to moderation, but all they have to do is put in a different username and email address when they comment and they get around that.
One other thing, IP addresses are no longer unique. ISPs assign multiple users to every IP address (sometimes hundreds or thousands) so blocking by IP is of no use as you might actually block comments from legitimate visitors in the same area, and again, all they have to do is go to a wi-fi hotspot to get around an IP blocking.
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