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We study the synchrotron component of the spectral energy distribution (SED)on the sample of 877 blazars using the ASDC SED Builder Tool with availablebroadband data from the literature. Our sample includes 423 flat-spectrum radiosources (FSRQs), 361 BL Lac objects and candidates, and 93 blazars of uncertaintype. We have made an estimation of the synchrotron peak frequency($\nu_{peak}^{s}$) for the 875 objects and further classified them as high,intermediate and low synchrotron peaked sources (HSPs/ISPs/LSPs). There are 42HSPs with $\nu_{peak}^{s} > 10^{16.5}$ Hz, 222 ISPs with $10^{14.5} <\nu_{peak}^{s} < 10^{16.5}$ Hz, and 611 LSPs with $\nu_{peak}^{s} < 10^{14.5}$Hz in our sample. We have calculated an average value of $\nu_{peak}^{s}$ to be$10^{13.4 \pm 1.0}$ Hz for FSRQs and $10^{14.6 \pm 1.4}$ Hz for BL Lacs. Wefound out that $\nu_{peak}^{s}$ and the flux density at 4.8 GHz have adifferent distribution (as indicated by Kolmogorov-Smirnov test at significancelevel 0.05) for the FSRQ and BL Lac blazars, and for the RBL and XBL types ofBL Lacs. Distribution of $\nu_{peak}^{s}$ values is broader for BL Lacs, thanfor FSRQs. There are no ultra-high energy peaked objects (with $\nu_{peak}^{s}> 10^{19}$ Hz) in our BL Lac sample according to our estimations. Thesignificant part of FSRQs (41%) and small part of BL Lacs (9%) in our samplecould be considered as candidates to the very-low synchrotron peaked blazars(with $\nu_{peak}^{s} < 10^{13}$ Hz). Our foundations confirm results of theprevious studies made on samples with significantly smaller number of objects.

The synchrotron component study in a spectral energy distribution of blazars