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Aims. We report new laboratory spectroscopic data on the rotational spectrum of the pyrimidine nucleic acid base uracil (C 4 H 4 N 2 O 2 ). The dataset has been extended both into the microwave region and towards mm-wavelengths with the aim of providing accurate transition rest frequencies for astrophysical searches. Methods. The microwave measurements have been performed with a molecular beam Fourier transform microwave spectrometer in the frequency range from 9-19 GHz and the mm-wave banddoi:10.1051/0004-6361:20065777 fatcat:ezm6t5xnujdppjx6ht5zecbc6m