AS15937 ADIF ADIF

ADIF ADIF · registered in Spain

IPv4 addresses8,1924 prefixes · <0.001% of announced IPv4

Rank in Spain#116largest network in ES by IPv4 space, of 926 · 0.03% of ES

Rank worldwide#10,591of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountrySpain954 ASNs registered there

Open AS15937 in ASN lookup Look up an IP in this network (213.144.32.1) All networks in Spain

IPv4 prefixes

All 4 prefixes, in address order.

213.144.32.0/20
213.144.48.0/22
213.144.52.0/22
213.144.56.0/21

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AS15633#115 UOC-AS Universitat Oberta de Catalunya8,192

AS16091#117 SATEC SISTEMAS AVANZADOS DE TECNOLOGIA SA8,192

AS20693#118 INTERNET-XPRESS-AS Nunsys SA8,192

AS39447#119 ZERTIA-AS ZERTIA TELECOMUNICACIONES S.L.8,192

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources