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To find out how much bandwidth I use everyday, I installed NetWorx, a monitor software, on my laptop.

To my surprise, even if I turned of all software that might use Internet, NetWrox still reports that my laptop downloaded 270MB in an hour. Considering my monthly download limitation is only 100GB, that's unacceptable.

How can I find out which software is secretly stealing my bandwidth?

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What OS are you running? – John T Feb 5 '11 at 20:55
Curious where you are being capped? Canada? – Aaron McIver Feb 5 '11 at 21:01
Yeah, I'm living in Canada. :D – ablmf Feb 6 '11 at 1:12
And which operating system? – phresnel Jan 19 at 12:43
@JohnT Windows 8 – ablmf Jan 19 at 15:09
up vote 5 down vote accepted

Have a play with TCPView, part of the excellent Sysinternals suite.

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With TCPView, I found I made a mistake when I setup NetWorx. I chose to monitor "all connection" instead of my wireless adapter. So a lot of loopback traffic was also recorded. – ablmf Feb 6 '11 at 1:15

If you are running Windows 7, the built-in resource monitor is good for a quick overview:

enter image description here

For more verbose statistics, Netlimite Monitor (free version) is even better for analyzing usage patterns:

enter image description here

The paid version allows you to throttle applications. Netlimiter Monitor is not yet available for Windows 7, although coming soon according to the download page (Netlimiter Monitor v3).

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