AS16246 AS16246 O2 Czech Republic, a.s.

AS16246 O2 Czech Republic, a.s. · registered in Czechia

IPv4 addresses133,12013 prefixes · 0.004% of announced IPv4

Rank in Czechia#10largest network in CZ by IPv4 space, of 570 · 1.61% of CZ

Rank worldwide#1,474of 79,396 networks with IPv4

IPv69 x /32 (589,824 x /48)2 prefixes

CountryCzechia599 ASNs registered there

Open AS16246 in ASN lookup Look up an IP in this network (77.87.232.1) All networks in Czechia

IPv4 prefixes

All 13 prefixes, in address order.

77.87.232.0/21
78.108.152.0/21
82.150.160.0/19
86.63.192.0/19
91.197.116.0/22
92.240.160.0/19
94.74.192.0/18
95.143.128.0/20
176.98.96.0/20
178.17.96.0/20
185.15.252.0/22
188.175.0.0/16
213.180.32.0/19

IPv6 prefixes

All 2 prefixes.

2a02:350::/29
2a03:b4c0::/32

Similar-sized networks in Czechia

ASNNameIPv4 addresses

AS42908#7 CZ-NORDICTELECOMREGIONAL O2 Czech Republic, a.s.183,296

AS2571#8 DHLNET - DHL Information Services (Europe) s.r.o152,832

AS28725#9 CETIN-AS CETIN a.s.134,400

AS25512#11 CDT-AS CD-Telematika a.s.117,760

AS44546#12 ALFATELECOM-AS ALFA TELECOM s.r.o.110,848

AS15425#13 COMA PODA a.s.110,592

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