Crosslink density or intercrosslink chain density of natural rubber vulcanizates with and without carbon black can be obtained by means of the H-1-NMR transversal relaxation, the analysis of uniaxial stress-strain measurements, the investigation of swelling properties and, in special cases of peroxide cured samples, by calculation. It is the objective of the present study to compare the results obtained with these techniques in order to find out the limits and possibilities. Therefore, several vulcanization systems with different types and concentrations of carbon black were investigated. Altogether, the results provide a consistent picture of network characteristics.