Any way to measure number of broadband users from web logs?

Are there any web log analysers that try to infer the number of broadband users? Not sure if is even possible, but was thinking you could get an estimate either by doing a reverse lookup on IP address and checking to see if the ISP is a known cable or dsl provider, or by measuring the download times for files and seeing if they are more consistant with dial-up ir broadband.

If not via log file analysis, is there any other tool or method to try and figure out what your user base looks like?

Thanks!

 

 

 

 

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