  We study the impact of maximal zeros of the Dirac mass matrix on neutrino
phenomenology and dark matter within the framework of an inverse seesaw ISS
$(2,3)$. ISS $(2,3)$ is obtained by adding two right handed neutrinos and three
gauge singlets sterile fermions to the standard model leading to an extra
sterile state in the keV range. The model is more predictive because of the
presence of fewer numbers of right handed neutrinos than the conventional
inverse seesaw. Moreover, texture zeros in the structures of the mass matrices
involved in the model can reduce the free parameters. We extensively study the
effect of different textures of Dirac mass matrix on sterile neutrino dark
matter phenomenology. Our study also includes the implications of these texture
zero mass matrices on low energy phenomena like neutrinoless double beta decay
(0$\nu\beta\beta$). The zero textures highly constrain the parameter space of
the model. Based on the allowed cosmological ranges of the relic abundance,
decay rates, and dark matter mixing with the active neutrinos, we study the
viability of the different textures within the framework.
