  We study numerically the phase-ordering kinetics following a temperature
quench of the Ising model with single spin flip dynamics on a class of graphs,
including geometrical fractals and random fractals, such as the percolation
cluster. For each structure we discuss the scaling properties and compute the
dynamical exponents. We show that the exponent $a_\chi$ for the integrated
response function, at variance with all the other exponents, is independent on
temperature and on the presence of pinning. This universal character suggests a
strict relation between $a_\chi$ and the topological properties of the
networks, in analogy to what observed on regular lattices.
