"NA" BGP Prefix causes error about ipisp HOT 7 CLOSED

This was the fix I have in place, but that will set Response.Range to nil, which may possibly break client code.

// Read range
if string(tokens[2]) != "NA" {
        if _, re.Range, err = net.ParseCIDR(string(tokens[2])); err != nil {
        return
        }
}

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Hmm.. How about setting it to 0.0.0.0/32?

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Since it's unknown I think 0.0.0.0/0 makes more sense

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I think it would be safer for a consumer to assume that the ISP contains no IP ranges than every IP.

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0.0.0.0/0 is known as the default route, but I can see where you're coming from.

How about something like using the IP address as a /32? For the above example 193.32.71.189/32?

All of the solutions feel hokey, so I don't have a good answer.

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Fixed in #15

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