  The Hod conjecture proposes that the asymptotic quasinormal frequencies
determine the entropy quantum of a black hole. Considering the Maggiore
modification of this conjecture we calculate the entropy spectra of general,
single horizon, asymptotically flat black holes in two-dimensional dilaton
gravity. We also compute the entropy quanta of the two-dimensional Witten and
AdS(2) black holes. Using the results for the entropy quanta of these
two-dimensional black holes we discuss whether the produced values are generic.
Finally we extend the results on the entropy spectra of other black holes.
