  The Inverse Seesaw naturally explains the smallness of neutrino masses via an
approximate $B-L$ symmetry broken only by a correspondingly small parameter. In
this work the possible dynamical generation of the Inverse Seesaw neutrino mass
mechanism from the spontaneous breaking of a gauged $U(1)$ $B-L$ symmetry is
investigated. Interestingly, the Inverse Seesaw pattern requires a chiral
content such that anomaly cancellation predicts the existence of extra fermions
belonging to a dark sector with large, non-trivial, charges under the $U(1)$
$B-L$. We investigate the phenomenology associated to these new states and find
that one of them is a viable dark matter candidate with mass around the TeV
scale, whose interaction with the Standard Model is mediated by the $Z'$ boson
associated to the gauged $U(1)$ $B-L$ symmetry. Given the large charges
required for anomaly cancellation in the dark sector, the $B-L$ $Z'$ interacts
preferentially with this dark sector rather than with the Standard Model. This
suppresses the rate at direct detection searches and thus alleviates the
constraints on $Z'$-mediated dark matter relic abundance. The collider
phenomenology of this elusive $Z'$ is also discussed.
