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We are approaching a new era to probe the 21-cm neutral hydrogen signal fromthe period of cosmic dawn. This signal offers a unique window to the virginUniverse, e.g., to study dark matter models with different small-scalebehaviours. The EDGES collaboration has recently published the first results ofthe global 21-cm spectrum. We demonstrate that such a signal can be used toset, unlike most observations concerning dark matter, both lower and upperlimits for the mass of dark matter particles. We study the 21-cm signalresulting from a simple warm dark matter model with a sharp-$k$ window functioncalibrated for high redshifts. We tie the PopIII star formation to Lyman-alphaand radio background production. Using MCMC to sample the parameter space wefind that to match the EDGES signal, a warm dark matter particle must have amass of $7.3^{+1.6}_{-3.3}$ keV at 68\% confidence interval. This translates to$2.2^{+1.4}_{-1.7} \times 10^{-20}$ eV for fuzzy dark matter and$63^{+19}_{-35}$ keV for Dodelson-Widrow sterile neutrinos. Cold dark matter isunable to reproduce the signal due to its slow structure growth.

Rapid onset of the 21-cm signal suggests a preferred mass range for dark matter particle