AS210728 CYSO-AS-DE Cyso Group B.V.

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

IPv4 addresses7683 prefixes · <0.001% of announced IPv4

Rank in Netherlands#609largest network in NL by IPv4 space, of 1,026 · <0.01% of NL

Rank worldwide#42,732of 79,396 networks with IPv4

IPv61 x /32 (65,536 x /48)1 prefixes

CountryNetherlands1,098 ASNs registered there

Open AS210728 in ASN lookup Look up an IP in this network (77.246.243.1) All networks in Netherlands

IPv4 prefixes

All 3 prefixes, in address order.

77.246.243.0/24
194.26.103.0/24
213.173.39.0/24

IPv6 prefixes

All 1 prefix.

2a11:2440::/32

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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