Results are presented from a systematic study with BeppoSAX of the broad band (0.1-200 keV) X-ray spectra of representative samples of AGNs including Seyfert 1 and 2 galaxies, Narrow Line Seyfert 1, low and high redshift quasars. For the brightest objects the presence and the strength of the reflection component and of the high energy cutoff will be discussed also in the light of their implications for the models of the X-ray background. Recent results on a medium-deep X-ray survey in the ``new'' 5-10 keV band will also be briefly outlined.

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