Autonomous System

AS29321 O2 Czech Republic, a.s.

ISPActiveCzechiaRIPE

AS29321 (CentroNetAS) is an ISP network operated by O2 Czech Republic, a.s. in Czechia, registered with RIPE. It has 5 IPv4 prefixes with 15,360 addresses and 1 IPv6 prefix, which makes it the 8,117th largest of 82,200 active autonomous systems by IPv4 space.

IPv4 addresses15,360in 5 prefixes
IPv6 prefixes1≈ 7.9 × 10²⁸ addresses
Size rank#8,117of 82,200 active ASNs
Abuser scoreVery Low0.02% of its addresses flagged · method

Details

OrganizationO2 Czech Republic, a.s.
AS nameCentroNetAS
Websiteo2.cz
Country Czechia (CZ)
Network typeISP
RegistryRIPE
Abuse contactabuse@o2.cz
Registered2003-07-31
Last updated2024-06-20

IPv4 prefixes

5 prefixes · 15,360 addresses
NetworkAddressesFirst – last address
80.243.96.0/204,09680.243.96.0 – 80.243.111.255
109.239.64.0/204,096109.239.64.0 – 109.239.79.255
217.195.160.0/204,096217.195.160.0 – 217.195.175.255
94.143.168.0/212,04894.143.168.0 – 94.143.175.255
194.59.240.0/221,024194.59.240.0 – 194.59.243.255

IPv6 prefixes

1 prefix
  • 2a02:b20::/32

Query AS29321 with the API

The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day. 

curl "https://api.ipapi.is/?q=AS29321&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS29321, with or without a key:

curl "https://api.ipapi.is/?q=80.243.96.1"

Other networks of O2 Czech Republic, a.s.

AS5610 O2 Czech Republic, a.s.2,327,808 IPv4 addressesAS42908 O2 Czech Republic, a.s.183,296 IPv4 addressesAS16246 O2 Czech Republic, a.s.133,120 IPv4 addressesAS31246 O2 Czech Republic, a.s.66,560 IPv4 addressesAS12570 O2 Czech Republic, a.s.53,760 IPv4 addressesAS41046 O2 Czech Republic, a.s.53,248 IPv4 addresses

Largest networks in Czechia

AS5610 O2 Czech Republic, a.s.2,327,808 IPv4 addressesAS16019 Vodafone Czech Republic a.s.1,210,368 IPv4 addressesAS13036 T-Mobile Czech Republic a.s.992,256 IPv4 addressesAS2852 CESNET z.s.p.o.858,112 IPv4 addressesAS44546 ALFA TELECOM s.r.o.527,616 IPv4 addressesAS2571 DHL Information Services (Europe) s.r.o438,528 IPv4 addresses