Can ISPs learn customers ADSL modem brand by any means?
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They can get a good idea if they care enough to look. They can see your modem's mac address, which if not changed leads them to the manufacturer.
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Unfundednut
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It wouldn't be very difficult. They'll know the MAC address of the modem and since each manufacturer has their own unique OUI it would be a trivial matter to match your modem MAC address to the manfufacturer of the modem.
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joeqwerty
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