Wednesday, January 13, 2010

Why IP addresses are no longer enough to identify internet users

" telcos have not been able to obtain huge blocks of address space to dish out one IP address per connected customer — the way in which ISPs have always worked. Instead, they are using relatively small address blocks and a NAT system, so that the same IP address is being simultaneously used by a large number of customers; often hundreds at a time.

This means that the only way in which they can offer a traceability service is if they are provided with an IP address and a timestamp AND ALSO with the TCP (or UDP) source port number. Without that source port value, the mobile firm can only narrow down the account being used to the extent that it must be one out of several hundred — and since those several hundred will have nothing in common, apart from their choice of phone company, law enforcement (or anyone else who cares) will be unable to go much further."

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Location Oakland, Ca - Private Investigator