The data on the structural organization of bulk nanoporous carbon materials produced from a number of carbides by selective etching reaction with chlorine are reported. The studies were carried out by the techniques of small angle X-ray scattering, X-ray diffraction, and high resolution transmission electron microscopy. It is found that the typical nanopore size is 1-2 nm depending on the carbide precursor type. Differently organized nanodomains are identified in the highly disordered carbon skeleton of the materials.