The RIAA or its auditing agencies located worldwide are smart enough to use standard Internet connections from various standard and common ISPs, so that you can't say which IP they use. If you discover them one day, the next day they will be on other connections, or their upstream ISP will have given them a new dynamic IP.
such filters are quite ineffective. If you detect them, it's only after the fact has been reported. A central police or authority will first attempt to use their own network, but if there are evidence that you are blocking them, they will try with other connections as well. It's so fast for them to switch their dynamic IPs: disconnect reconnect with a new session... a matter of less than 1 second if performed from fast networks connected to ISPs infrastructures...

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