Some of this information is available at CPAN Testers. As new or updated modules get uploaded to the PAUSE servers, there are people who get notified of the new release. They then download the modules and test on whatever platforms they have available. The results are stored here.

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print map { my ($m)=1<<hex($_)&11?' ':'';
$m.=substr('AHJPacehklnorstu',hex($_),1) }
split //,'2fde0abe76c36c914586c';
[download]