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Methanol masers at 6.7 GHz are the brightest of class II methanol masers andhave been found exclusively towards massive star forming regions. These maserscan thus be used as a unique tool to probe the early phases of massive starformation. We present here a study of the spectral energy distributions of 3206.7 GHz methanol masers chosen from the MMB catalogue, which fall in the Hi-GALrange ($|l| \le 60^{\circ}$, $|b| \le 1^{\circ}$). The spectral energydistributions are constructed from $870 - 70~\mu$m using data from the ATLASGALand Hi-GAL surveys. The emission from cold dust is modelled by a single greybody component fit. We estimate the clump properties such as mass, FIRluminosity and column density using the best fit parameters of the SED fits.Considering the Kauffman criteria for massive star formation, we find that allbut a few maser hosts have the potential to harbour at least one high massstar. The physical properties of the methanol maser hosts are also discussed.The evolutionary stages of 6.7 GHz maser sources, explored using the massluminosity diagram, suggests that they are predominantly associated with highmass stars with the majority being in the accretion phase. However, we observea small number of sources that could possibly be related to intermediate orlow-mass stars.

Probing the early phases of high mass star formation with 6.7 GHz methanol masers