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Blazars are potential candidates of cosmic-ray acceleration up to ultrahighenergies ($E\gtrsim10^{18}$ eV). For an efficient cosmic-ray injection fromblazars, $p\gamma$ collisions with the extragalactic background light (EBL) andcosmic microwave background (CMB) can produce neutrino spectrum peaks near PeVand EeV energies, respectively. We analyze the contribution of these neutrinosto the diffuse background measured by the IceCube neutrino observatory. Thefraction of neutrino luminosity originating from individual redshift ranges iscalculated using the distribution of BL Lacs and FSRQs provided in the\textit{Fermi}-LAT 4LAC catalog. Furthermore, we use a luminosity dependentdensity evolution to find the neutrino flux from unresolved blazars. Theresults obtained in our model indicate that as much as $\approx10\%$ of theflux upper bound at a few PeV energies can arise from cosmic-ray interactionson EBL. The same interactions will also produce secondary electrons andphotons, initiating electromagnetic cascades. The resultant photon spectrum islimited by the isotropic diffuse $\gamma$-ray flux measured between 100 MeV and820 GeV. The latter, together with the observed cosmic-ray flux at$E>10^{16.5}$ eV, can constrain the baryonic loading factor depending on themaximum cosmic-ray acceleration energy.

PeV-EeV neutrinos from gamma-ray blazars due to ultrahigh-energy cosmic-ray propagation