Resumen: Hardy kernels are a useful tool to define integral operators on Hilbertian spaces like L2 (R+) or H2 (C+). These kernels entail an algebraic L1-structure which is used in this work to study the range spaces of those operators as reproducing kernel Hilbert spaces. We obtain their reproducing kernels, which in the H2 (R+) case turn out to be Hardy kernels as well. In the H2 (C+) scenario, the reproducing kernels are given by holomorphic extensions of Hardy kernels. Other results presented here are theorems of Paley-Wiener type, and a connection with one-sided Hilbert transforms. Idioma: Inglés DOI: 10.4153/S0008439522000406 Año: 2023 Publicado en: Canadian Mathematical Bulletin 66, 2 (2023), 428-442 ISSN: 0008-4395 Factor impacto JCR: 0.5 (2023) Categ. JCR: MATHEMATICS rank: 326 / 490 = 0.665 (2023) - Q3 - T3 Factor impacto CITESCORE: 1.3 - Mathematics (all) (Q3)