iragnsep performs IR SED fits separated into AGN and galaxy contributions, and measures host galaxy properties free of AGN contamination. The advantage of iragnsep is that, in addition to fitting observed broadband photometric fluxes, it also incorporates IR spectra in the fits which, if available, improves the robustness of the galaxy-AGN separation. For the galaxy component, iragnsep uses a library of galaxy templates. In terms of the AGN contribution, if the input dataset is a mixture of spectral and photometric data, iragnsep uses a combination of power-laws for the AGN continuum, and some broad features for the silicate emission. If instead the dataset contains photometric data alone, the AGN contribution is accounted for by using a library of AGN templates. The advanced fitting techniques used by iragnsep combined with the powerful model comparison tests allows iragnsep to provide a statistically robust interpretation of IR SEDs in terms of AGN-galaxy contributions, even when the AGN contribution is highly diluted by the host galaxy emission.