If you look at the author's page on CPAN, you'll see a list of Registered Modules for that author (see here
for an example).
The codes after each module name indicate whether the module uses a combination of C and Perl (look for the 'c' flag) - for example, DBD::Sybase has flags of RcmOp.
More information on these flags is here.
I don't know if all modules on CPAN have these flags associated with them, though, so this may or may not help you :)
Are you posting in the right place? Check out Where do I post X? to know for sure.
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Want more info? How to link or
or How to display code and escape characters
are good places to start.