Autonomous System
AS42306 CEZNET s.r.o.
ISPActiveCzechiaRIPE
AS42306 (EDERA_Group) is an ISP network operated by CEZNET s.r.o. in Czechia, registered with RIPE. It has 8 IPv4 prefixes with 20,480 addresses and 4 IPv6 prefixes, which makes it the 6,784th largest of 82,283 active autonomous systems by IPv4 space.
IPv4 addresses20,480in 8 prefixes
IPv6 prefixes4≈ 2.5 × 10³⁰ addresses
Size rank#6,784of 82,283 active ASNs
Details
OrganizationCEZNET s.r.o.
AS nameEDERA_Group
Websiteceznet.cz
Country Czechia (CZ)
Network typeISP
RegistryRIPE
Abuse contactdohled@ceznet.cz
Registered2007-02-19
Last updated2026-10-05
IPv4 prefixes
8 prefixes · 20,480 addresses| Network | Addresses | First – last address |
|---|---|---|
| 77.236.192.0/19 | 8,192 | 77.236.192.0 – 77.236.223.255 |
| 93.89.144.0/20 | 4,096 | 93.89.144.0 – 93.89.159.255 |
| 46.253.96.0/21 | 2,048 | 46.253.96.0 – 46.253.103.255 |
| 46.253.104.0/21 | 2,048 | 46.253.104.0 – 46.253.111.255 |
| 37.44.208.0/22 | 1,024 | 37.44.208.0 – 37.44.211.255 |
| 176.123.12.0/22 | 1,024 | 176.123.12.0 – 176.123.15.255 |
| 185.134.160.0/22 | 1,024 | 185.134.160.0 – 185.134.163.255 |
| 185.137.144.0/22 | 1,024 | 185.137.144.0 – 185.137.147.255 |
77.236.192.0/19 93.89.144.0/20 46.253.96.0/21 46.253.104.0/21 37.44.208.0/22 176.123.12.0/22 185.134.160.0/22 185.137.144.0/22
IPv6 prefixes
4 prefixes- 2a03:f280::/29
- 2a06:ed40::/29
- 2a07:4c0::/29
- 2a0e:5340::/29
2a03:f280::/29 2a06:ed40::/29 2a07:4c0::/29 2a0e:5340::/29
Query AS42306 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=AS42306&key=YOUR_API_KEY"Any address in its prefixes resolves to AS42306, with or without a key:
curl "https://api.ipapi.is/?q=77.236.192.1"Other networks of CEZNET s.r.o.
AS6740 CEZNET s.r.o.41,984 IPv4 addressesAS25424 CEZNET s.r.o.33,792 IPv4 addressesAS49101 CEZNET s.r.o.16,384 IPv4 addressesAS57728 CEZNET s.r.o.15,360 IPv4 addresses
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