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Submission + - Identification through Reverse DNS?

An anonymous reader writes: I've recently noticed that the reverse DNS name given to my IP from my ISP contains my mac address. It seems to me that regardless of IP address/dhcp logs that this could serve as a permanent unique identifier for a person. How many other ISPs do this? Are we clearing our google cookies periodically for nothing? Is this a privacy hole that should be closed up? I can see the ISPs internally being able to recognize their clients uniquely, but to the rest of the Internet is it a security violation for people to be tracked by an unchanging hostname?

Just about every computer on the market today runs Unix, except the Mac (and nobody cares about it). -- Bill Joy 6/21/85

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