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We have measured the temperature dependence of the conductivity $\sigma_{xx}$of a two-dimensional electron system deep into the localized regime of thequantum Hall plateau transition. Using variable-range hopping theory we areable to extract directly the localization length $\xi$ from this experiment. Weuse our results to study the scaling behavior of $\xi$ as a function of thefilling factor distance $|\delta \nu|$ to the critical point of the transition.We find for all samples a power-law behavior $\xi\propto|\delta\nu|^{-\gamma}$with a universal scaling exponent $\gamma = 2.3$ as proposed theoretically

Hopping Conductivity in the Quantum Hall Effect: Revival of Universal Scaling