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We consider a concise dark matter (DM) scenario in the context of anon-exotic U(1) extension of the Standard Model (SM), where a new U(1)$_X$gauge symmetry is introduced along with three generation of right-handedneutrinos (RHNs) and an SM gauge singlet Higgs field. The model is ageneralization of the minimal gauged U(1)$_{B-L}$ (baryon number minus leptonnumber) extension of the SM, in which the extra U(1)$_X$ gauge symmetry isexpressed as a linear combination of the SM U(1)$_Y$ and U(1)$_{B-L}$ gaugesymmetries. We introduce a $Z_2$-parity and assign an odd-parity only for oneRHN among all particles, so that this $Z_2$-odd RHN plays a role of DM. Theso-called minimal seesaw mechanism is implemented in this model with only two$Z_2$-even RHNs. In this context, we investigate physics of the RHN DM,focusing on the case that this DM particle communicates with the SM particlesthrough the U(1)$_X$ gauge boson ($Z^\prime$ boson). This "$Z^\prime$-portalRHN DM" scenario is controlled by only three free parameters: the U(1)$_X$gauge coupling ($\alpha_X$), the $Z^\prime$ boson mass ($m_{Z^\prime}$), andthe U(1)$_X$ charge of the SM Higgs doublet ($x_H$). We consider variousphenomenological constraints to identify a phenomenologically viable parameterspace. The most important constraints are the observed DM relic abundance andthe latest LHC Run-2 results on the search for a narrow resonance with thedi-lepton final state. We find that these are complementary with each other andnarrow the allowed parameter region, leading to the lower mass bound of$m_{Z^\prime} \gtrsim 2.7$ TeV.

$Z^\prime$-portal right-handed neutrino dark matter in the minimal U(1)$_X$ extended Standard Model