AS29321 CentroNetAS O2 Czech Republic, a.s.

CentroNetAS O2 Czech Republic, a.s. · registered in Czechia

IPv4 addresses15,3605 prefixes · <0.001% of announced IPv4

Rank in Czechia#44largest network in CZ by IPv4 space, of 570 · 0.19% of CZ

Rank worldwide#7,266of 79,396 networks with IPv4

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

CountryCzechia599 ASNs registered there

Open AS29321 in ASN lookup Look up an IP in this network (80.243.96.1) All networks in Czechia

IPv4 prefixes

All 5 prefixes, in address order.

80.243.96.0/20
94.143.168.0/21
109.239.64.0/20
194.59.240.0/22
217.195.160.0/20

IPv6 prefixes

All 1 prefix.

2a02:b20::/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