Distribution of spam origins


The other day, I stumbled across a handy-dandy table on the Internet somewhere that has a list of IP ranges and the country that they are reserved for.  Just for fun, I wrote a script that lets me enter in an IP and then the country where it is assigned pops back to the screen.  I then randomly sampled 2500 IPs that sent us a lot of spam and then mapped those results to a map of the world.

The below diagram is the result of that mapping.  The worst offenders should surprise no one – the US and China.  This is concentration by IP, not by total mail from these IPs.

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The top five worst countries are the US, China, India (surprising), Turkey and Brazil.  These 5 combined accounted for half of our spam on this one particular day.

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I thought that these results were interesting.