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AS5610 O2-CZECH-REPUBLIC O2 Czech Republic, a.s.

O2-CZECH-REPUBLIC O2 Czech Republic, a.s. · registered in Czechia

IPv4 addresses1,540,608101 prefixes · 0.049% of announced IPv4
Rank in Czechia#1largest network in CZ by IPv4 space, of 570 · 18.62% of CZ
Rank worldwide#256of 79,396 networks with IPv4
IPv611 x /32 (720,897 x /48)4 prefixes
CountryCzechia599 ASNs registered there
Open AS5610 in ASN lookup Look up an IP in this network (5.23.39.1) All networks in Czechia

IPv4 prefixes

All 101 prefixes, in address order.

  • 5.23.39.0/24
  • 37.188.128.0/17
  • 80.188.0.0/19
  • 80.188.32.0/21
  • 80.188.40.0/24
  • 80.188.41.0/24
  • 80.188.42.0/23
  • 80.188.44.0/22
  • 80.188.48.0/20
  • 80.188.64.0/18
  • 80.188.128.0/18
  • 80.188.192.0/20
  • 80.188.208.0/21
  • 80.188.216.0/22
  • 80.188.220.0/23
  • 80.188.222.0/24
  • 80.188.223.0/24
  • 80.188.224.0/19
  • 81.90.160.0/21
  • 81.90.168.0/24
  • 81.90.169.0/24
  • 81.90.170.0/24
  • 81.90.171.0/24
  • 81.90.172.0/23
  • 81.90.174.0/23
  • 83.69.32.0/19
  • 83.208.0.0/17
  • 83.208.128.0/18
  • 83.208.192.0/19
  • 83.208.224.0/19
  • 85.70.0.0/15
  • 85.160.0.0/15
  • 85.193.0.0/18
  • 88.83.160.0/20
  • 88.83.176.0/20
  • 88.100.0.0/15
  • 88.102.0.0/16
  • 88.103.0.0/16
  • 90.176.32.0/19
  • 90.176.64.0/18
  • 90.176.128.0/19
  • 90.176.160.0/21
  • 90.176.168.0/23
  • 90.176.170.0/24
  • 90.176.171.0/24
  • 90.176.172.0/22
  • 90.176.176.0/20
  • 90.176.192.0/18
  • 90.177.0.0/16
  • 90.178.0.0/15
  • 90.180.0.0/15
  • 90.182.0.0/18
  • 90.182.64.0/19
  • 90.182.96.0/21
  • 90.182.104.0/22
  • 90.182.108.0/24
  • 90.182.109.0/24
  • 90.182.110.0/23
  • 90.182.112.0/20
  • 90.182.128.0/17
  • 90.183.0.0/16
  • 91.191.64.0/22
  • 91.191.68.0/24
  • 91.191.70.0/23
  • 91.191.72.0/21
  • 91.191.84.0/22
  • 91.191.88.0/21
  • 91.191.96.0/19
  • 91.193.132.0/22
  • 91.213.10.0/24
  • 91.232.82.0/24
  • 92.243.192.0/19
  • 109.80.0.0/16
  • 109.81.0.0/17
  • 109.81.128.0/19
  • 109.81.160.0/20
  • 109.81.176.0/20
  • 109.81.192.0/18
  • 160.218.0.0/16
  • 161.195.144.0/24
  • 185.61.228.0/22
  • 185.143.112.0/22
  • 193.17.13.0/24
  • 193.84.12.0/22
  • 194.50.248.0/23
  • 194.165.47.0/24
  • 194.228.0.0/18
  • 194.228.64.0/21
  • 194.228.72.0/22
  • 194.228.76.0/22
  • 194.228.80.0/20
  • 194.228.96.0/19
  • 194.228.128.0/20
  • 194.228.144.0/21
  • 194.228.152.0/22
  • 194.228.158.0/23
  • 194.228.160.0/19
  • 194.228.192.0/18
  • 195.5.186.0/24
  • 217.117.208.0/20
  • 217.194.160.0/20

IPv6 prefixes

All 4 prefixes.

  • 2001:67c:dd4::/48
  • 2001:41d8::/32
  • 2a00:1028::/29
  • 2a02:9b8::/31

Similar-sized networks in Czechia

ASNNameIPv4 addresses
AS16019#2 VODAFONE-CZ-AS Vodafone Czech Republic a.s.1,210,368
AS13036#3 TMOBILE-CZ T-Mobile Czech Republic a.s.992,256
AS2852#4 CESNET2 CESNET z.s.p.o.849,920

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