Autonomous System
AS2852 CESNET z.s.p.o.
EducationActiveCzechiaRIPE
AS2852 (CESNET2) is an education network operated by CESNET z.s.p.o. in Czechia, registered with RIPE. It has 26 IPv4 prefixes with 858,112 addresses and 1 IPv6 prefix, which makes it the 489th largest of 82,200 active autonomous systems by IPv4 space.
IPv4 addresses858,112in 26 prefixes
IPv6 prefixes1≈ 6.3 × 10²⁹ addresses
Size rank#489of 82,200 active ASNs
Details
OrganizationCESNET z.s.p.o.
AS nameCESNET2
Websitecesnet.cz
Country Czechia (CZ)
Network typeEducation
RegistryRIPE
Abuse contactabuse@cesnet.cz
Registered2002-06-22
Last updated2026-09-13
IPv4 prefixes
26 prefixes · 858,112 addresses| Network | Addresses | First – last address |
|---|---|---|
| 146.102.0.0/16 | 65,536 | 146.102.0.0 – 146.102.255.255 |
| 147.32.0.0/16 | 65,536 | 147.32.0.0 – 147.32.255.255 |
| 147.33.0.0/16 | 65,536 | 147.33.0.0 – 147.33.255.255 |
| 147.228.0.0/16 | 65,536 | 147.228.0.0 – 147.228.255.255 |
| 147.230.0.0/16 | 65,536 | 147.230.0.0 – 147.230.255.255 |
| 147.231.0.0/16 | 65,536 | 147.231.0.0 – 147.231.255.255 |
| 147.251.0.0/16 | 65,536 | 147.251.0.0 – 147.251.255.255 |
| 158.194.0.0/16 | 65,536 | 158.194.0.0 – 158.194.255.255 |
| 158.196.0.0/16 | 65,536 | 158.196.0.0 – 158.196.255.255 |
| 160.216.0.0/16 | 65,536 | 160.216.0.0 – 160.216.255.255 |
| 160.217.0.0/16 | 65,536 | 160.217.0.0 – 160.217.255.255 |
| 195.113.0.0/16 | 65,536 | 195.113.0.0 – 195.113.255.255 |
| 78.128.128.0/17 | 32,768 | 78.128.128.0 – 78.128.255.255 |
| 193.84.192.0/19 | 8,192 | 193.84.192.0 – 193.84.223.255 |
| 195.178.64.0/19 | 8,192 | 195.178.64.0 – 195.178.95.255 |
| 193.84.32.0/20 | 4,096 | 193.84.32.0 – 193.84.47.255 |
| 193.84.160.0/20 | 4,096 | 193.84.160.0 – 193.84.175.255 |
| 193.84.192.0/20 | 4,096 | 193.84.192.0 – 193.84.207.255 |
| 193.84.208.0/20 | 4,096 | 193.84.208.0 – 193.84.223.255 |
| 193.84.56.0/21 | 2,048 | 193.84.56.0 – 193.84.63.255 |
| 185.8.160.0/22 | 1,024 | 185.8.160.0 – 185.8.163.255 |
| 193.84.80.0/22 | 1,024 | 193.84.80.0 – 193.84.83.255 |
| 193.84.104.0/22 | 1,024 | 193.84.104.0 – 193.84.107.255 |
| 193.84.116.0/23 | 512 | 193.84.116.0 – 193.84.117.255 |
| 193.84.53.0/24 | 256 | 193.84.53.0 – 193.84.53.255 |
146.102.0.0/16 147.32.0.0/16 147.33.0.0/16 147.228.0.0/16 147.230.0.0/16 147.231.0.0/16 147.251.0.0/16 158.194.0.0/16 158.196.0.0/16 160.216.0.0/16 160.217.0.0/16 195.113.0.0/16 78.128.128.0/17 193.84.192.0/19 195.178.64.0/19 193.84.32.0/20 193.84.160.0/20 193.84.192.0/20 193.84.208.0/20 193.84.56.0/21 185.8.160.0/22 193.84.80.0/22 193.84.104.0/22 193.84.116.0/23 193.84.53.0/24
The 25 largest of 26. The API and the database have all of them.
IPv6 prefixes
1 prefix- 2001:718::/29
2001:718::/29
Query AS2852 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=AS2852&key=YOUR_API_KEY"Any address in its prefixes resolves to AS2852, with or without a key:
curl "https://api.ipapi.is/?q=146.102.0.1"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 addressesAS44546 ALFA TELECOM s.r.o.527,616 IPv4 addressesAS2571 DHL Information Services (Europe) s.r.o438,528 IPv4 addressesAS29208 Quantcom, a.s.274,432 IPv4 addresses