AS25151 CYSO-AS Cyso Group B.V.

CYSO-AS Cyso Group B.V. · registered in the Netherlands

IPv4 addresses14,84816 prefixes · <0.001% of announced IPv4

Rank in Netherlands#116largest network in NL by IPv4 space, of 1,026 · 0.03% of NL

Rank worldwide#7,360of 79,396 networks with IPv4

IPv69 x /32 (589,825 x /48)3 prefixes

CountryNetherlands1,098 ASNs registered there

Open AS25151 in ASN lookup Look up an IP in this network (2.57.56.1) All networks in Netherlands

IPv4 prefixes

All 16 prefixes, in address order.

2.57.56.0/24
37.46.136.0/21
37.72.138.0/24
45.134.223.0/24
62.129.139.0/24
62.129.149.0/24
80.85.160.0/23
81.24.0.0/21
81.24.8.0/22
85.158.200.0/21
93.94.224.0/21
109.235.72.0/21
130.193.5.0/24
185.54.112.0/22
185.123.55.0/24
193.33.220.0/24

IPv6 prefixes

All 3 prefixes.

2001:678:c50::/48
2a01:518::/32
2a05:6cc0::/29

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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