AS198121 DNS4EU Whalebone, s.r.o.

DNS4EU Whalebone, s.r.o. · registered in Czechia

IPv4 addresses2561 prefixes · <0.001% of announced IPv4

Rank in Czechia#509largest network in CZ by IPv4 space, of 570 · <0.01% of CZ

Rank worldwide#60,906of 79,396 networks with IPv4

IPv62 x /482 prefixes

CountryCzechia599 ASNs registered there

Open AS198121 in ASN lookup Look up an IP in this network (86.54.11.1) All networks in Czechia

IPv4 prefixes

All 1 prefix, in address order.

86.54.11.0/24

IPv6 prefixes

All 2 prefixes.

2a13:1000:fff1::/48
2a13:1001::/48

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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