The IceCube Neutrino Observatory is an array of 5,160 photomultipliers (PMTs) deployed on 86 strings at 1.5-2.5 km depth within the ice at the South Pole. The main goal of the IceCube experiment is the detection of an astrophysical neutrino signal. Three years of IceCube data have been analyzed for the search of neutrino point-sources. In the case of point-sources of neutrino emission, the IceCube neutrino telescope is sensitive to sources with E −2 spectra mainly in the TeV-PeV energy range in

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... the northern sky. In the opposite hemisphere the detector is most sensitive to sources with harder spectra to which IceCube is mostly sensitive between PeV-EeV energies. In the absence of evidence for a cosmic signal from a point-source in these there years of data the upper limits in the neutrino flux are set. These limits are constraining the parameter space of models of neutrino emission from both galactic and extra-galactic sources as shown in this contribution.