ADIF
AS15937 (ADIF) announces at least two prefixes:
213.144.32.0/19
Unidad de servicios informaticos de ADIF
about a second ago
213.144.32.0-213.144.47.255
213.144.48.0/22
RENFE-OPERADORA
213.144.48.0-213.144.63.255
0