Phantom-like behavior in f(R)-gravity

We investigate possible realization of the phantom-like behavior in the framework of f(R)-gravity models where there are no phantom fields in the matter sector of the theory. By adopting some observationally reliable ansatz for f(R), we show that it is possible to realize phantom-like behavior in f(R)-gravity without introduction of phantom fields that suffer from instabilities and violation of the null energy condition. Depending on the choice of f(R), the null energy condition is fulfilled in some subspaces of each model parameter space.