  In the last few years our knowledge of the physics of massive stars has
improved tremendously. However, further investigations are still needed,
especially regarding accurate calibrations of their fundamental parameters. To
this end, we have constructed a comprehensive grid of NLTE model atmospheres
and corresponding synthetic spectra in the massive star domain. The grid covers
the complete B type spectral range, extended to late O on the hot side and
early A on the cool side, from supergiants to dwarfs and from weak stellar
winds to very strong ones. It has been calculated with the latest version of
the FASTWIND code. The analysis of an extensive sample of OB stars in the
framework of the COROT space mission will lead to accurate calibrations of
effective temperatures, gravities, mass loss rates etc. This paper contains a
detailed description of the grid, which has been baptised as BSTAR06 and which
will be available for further research in the near future.
