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Hawking radiation from primordial black holes (PBH) can ionize and heat upneutral gas during the cosmic dark ages, leaving imprints on the global 21-cmsignal of neutral hydrogen. We use the global 21-cm signal to constrain theabundance of spinning PBHs in mass range of $[2 \times 10^{13}, 10^{18}]$grams. We consider several extended PBH distribution models. Our results showthat 21-cm can set the most stringent PBH bounds in our mass window. Comparedwith constraints set by {\it Planck} cosmic microwave background (CMB) data,21-cm limits are more stringent by about two orders of magnitudes. PBHs withhigher spin are typically more strongly constrained. Our 21-cm constraints forthe monochromatic mass distribution rule out spinless PBHs with initial massbelow $1.5 \times 10^{17}\ \r{g}$, whereas extreme Kerr PBHs with reducedinitial spin of $a_0=0.999$ are excluded as the dominant dark matter componentfor masses below $6 \times 10^{17}\ \r{g}$. We also derived limits for thelog-normal, power-law and critical collapse PBH mass distributions.

21-cm constraints on spinning primordial black holes