AS51800 FIBERNET-ASN FIBER Network s.r.o.

FIBERNET-ASN FIBER Network s.r.o. · registered in Czechia

IPv4 addresses2,0481 prefixes · <0.001% of announced IPv4

Rank in Czechia#208largest network in CZ by IPv4 space, of 570 · 0.02% of CZ

Rank worldwide#21,604of 79,396 networks with IPv4

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

CountryCzechia599 ASNs registered there

Open AS51800 in ASN lookup Look up an IP in this network (217.28.80.1) All networks in Czechia

IPv4 prefixes

All 1 prefix, in address order.

217.28.80.0/21

IPv6 prefixes

All 1 prefix.

2a02:28a8::/32

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AS197277#210 SUKL_AS State Institute for Drug Control2,048

AS198282#211 cablenet CAH Building s.r.o.2,048

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