  We consider numerical fits to non-supersymmetric $\mathrm{SO}(10)$-based
models in which neutrino mass is generated by the type-I or type-II seesaw
mechanism or a combination of both. The fits are performed with a sophisticated
top-down procedure, taking into account the renormalization group equations of
the gauge and Yukawa couplings, integrating out relevant degrees of freedom at
their corresponding mass scales, and using recent data for the Standard Model
observables. We find acceptable fits for normal neutrino mass ordering only and
with neutrino mass generated by either type-I seesaw only or a combination of
types I and II seesaw in which type-I seesaw is dominant. Furthermore, we find
predictions from the best fit regarding the small neutrino masses, the
effective neutrinoless double beta decay mass, and the leptonic CP-violating
phase. Finally, we show that the fits are rather insensitive to the chosen
value of the unification scale.
