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KASCADE and KASCADE-Grande were multi-detector installations to measureindividual air showers of cosmic rays at ultra-high energy. Based on data setsmeasured by KASCADE and KASCADE-Grande, 90% C.L. upper limits to the flux ofgamma-rays in the primary cosmic ray flux are determined in an energy range of${10}^{14} - {10}^{18}$ eV. The analysis is performed by selecting air showerswith a low muon content as expected for gamma-ray-induced showers compared toair showers induced by energetic nuclei. The best upper limit of the fractionof gamma-rays to the total cosmic ray flux is obtained at $3.7 \times{10}^{15}$ eV with $1.1 \times {10}^{-5}$. Translated to an absolute gamma-rayflux this sets constraints on some fundamental astrophysical models, such asthe distance of sources for at least one of the IceCube neutrino excess models.

KASCADE-Grande Limits on the Isotropic Diffuse Gamma-Ray Flux between 100 TeV and 1 EeV