[squid-users] How to block shoutcast streams?

Hello all.
I'm getting reports which show huge traffic amounts on some http IP
addresses. These point to ports like 9000, 8000, 8100, 9720, and the
like. When I put those URLs in the browser, I get to some shoutcast
servers (let's take as an example: http://213.35.156.16:9000/). How may
I block this sort of streaming media?
Here the relevant log lines:

1131956633.216 7236 10.167.211.62 TCP_MISS/600 298294 GET
http://213.35.156.16:9000/ -
FIRST_PARENT_MISS/proxy.reteunitaria.piemonte.it -
1131965732.540 917 10.167.211.62 TCP_MISS/600 25021 GET
http://213.35.156.16:9000/ -
FIRST_PARENT_MISS/proxy.reteunitaria.piemonte.it -
1131965815.003 81204 10.167.211.62 TCP_MISS/600 2093292 GET
http://213.35.156.16:9000/ -
TIMEOUT_FIRST_UP_PARENT/proxy.reteunitaria.piemonte.it -
1131982736.548 6082 10.167.211.62 TCP_MISS/600 362948 GET
http://213.35.156.16:9000/ -
TIMEOUT_FIRST_UP_PARENT/proxy.reteunitaria.piemonte.it -
1131985079.527 2613 10.167.211.62 TCP_MISS/600 163257 GET
http://213.35.156.16:8000/ -
FIRST_PARENT_MISS/proxy.reteunitaria.piemonte.it -
1131985825.545 2244 10.167.211.62 TCP_MISS/600 106951 GET
http://213.35.156.16:9000/ -
FIRST_PARENT_MISS/proxy.reteunitaria.piemonte.it -
1131986644.367 7009798 10.167.211.163 TCP_MISS/600 168504426 GET
http://213.35.156.16:8000/ -
FIRST_PARENT_MISS/proxy.reteunitaria.piemonte.it -

As you can see, there's nothing more than the URL, no MIME type
indication at all!

Any help would be appreciated.

Thanks in advance,

-- 
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Boniforti Flavio
Provincia del Verbano-Cusio-Ossola
Ufficio Informatica
Tecnoparco del Lago Maggiore
Via dell'Industria, 25
28924 Verbania
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