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AS42908 CZ-NORDICTELECOMREGIONAL O2 Czech Republic, a.s.

CZ-NORDICTELECOMREGIONAL O2 Czech Republic, a.s. · registered in Czechia

IPv4 addresses183,29635 prefixes · 0.006% of announced IPv4
Rank in Czechia#7largest network in CZ by IPv4 space, of 570 · 2.21% of CZ
Rank worldwide#1,159of 79,396 networks with IPv4
IPv637 x /32 (2,424,832 x /48)9 prefixes
CountryCzechia599 ASNs registered there
Open AS42908 in ASN lookup Look up an IP in this network (5.102.48.1) All networks in Czechia

IPv4 prefixes

All 35 prefixes, in address order.

  • 5.102.48.0/20
  • 31.10.56.0/21
  • 45.159.116.0/22
  • 46.183.56.0/21
  • 46.231.72.0/21
  • 77.95.192.0/21
  • 78.136.128.0/18
  • 80.78.136.0/22
  • 80.79.0.0/22
  • 80.87.176.0/20
  • 80.90.128.0/20
  • 80.243.236.0/22
  • 80.251.240.0/20
  • 88.81.64.0/19
  • 91.187.32.0/19
  • 92.61.80.0/20
  • 93.92.48.0/21
  • 93.93.32.0/21
  • 94.241.64.0/18
  • 109.108.96.0/19
  • 176.102.128.0/19
  • 178.17.80.0/20
  • 185.78.12.0/22
  • 185.82.236.0/22
  • 185.108.60.0/22
  • 185.157.240.0/22
  • 188.119.96.0/22
  • 193.42.128.0/22
  • 193.107.252.0/22
  • 213.19.0.0/17
  • 213.155.32.0/19
  • 213.250.192.0/18
  • 217.170.96.0/20
  • 217.196.112.0/20
  • 217.197.144.0/20

IPv6 prefixes

All 9 prefixes.

  • 2a00:e4c0::/32
  • 2a01:9f40::/29
  • 2a02:2428::/32
  • 2a02:2588::/29
  • 2a03:1600::/32
  • 2a03:7a00::/32
  • 2a03:a820::/32
  • 2a07:cc80::/29
  • 2a0c:8b40::/29

Similar-sized networks in Czechia

ASNNameIPv4 addresses
AS2852#4 CESNET2 CESNET z.s.p.o.849,920
AS29208#5 QUANTCOM-AS Quantcom, a.s.265,984
AS30764#6 PODA-AS PODA a.s.218,112
AS2571#8 DHLNET - DHL Information Services (Europe) s.r.o152,832
AS28725#9 CETIN-AS CETIN a.s.134,400
AS16246#10 AS16246 O2 Czech Republic, a.s.133,120

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