AS2852 CESNET
AS2852 is operated by CESNET and registered with RIPE NCC (CZ) since 1993-12-20.
It announces 27 IPv4 and 1 IPv6 prefixes, 100% of them RPKI valid.
RIPE RIS sees 63 upstream and peer networks and 29 downstream networks next to it.
PeeringDB lists it as an Educational/Research network at 3 internet exchanges. Its peering policy is selective.
| Name | CESNET |
|---|---|
| Registry (RIR) | RIPE NCC |
| Country | Czechia (CZ) |
| Delegated on | 1993-12-20 |
| Network type | Educational/Research, Europe |
| Peering policy | Selective |
| IRR as-set | RIPE::AS2852:AS-CESNET-GOOGLE |
| Prefixes (IPv4 / IPv6) | 27 / 1 |
| RPKI valid | 100% (28 / 28) |
| Upstreams and peers | 63 |
| Downstream networks | 29 |
| Website | cesnet.cz |
Routing health
- AS2852 announces 27 IPv4 and 1 IPv6 prefixes.
- All 28 announced prefixes are RPKI valid.
- 63 upstreams and peers, 29 downstream networks seen.
For every check with the fix (IRR route objects, the RPKI state of each route, reverse DNS and the registration), run the full network report.
Announced prefixes 28
- 78.128.128.0/17
- 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
- 147.231.150.0/24
- 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
- 185.8.160.0/22
- 193.84.32.0/20
- 193.84.53.0/24
- 193.84.55.0/24
- 193.84.56.0/21
- 193.84.80.0/22
- 193.84.104.0/22
- 193.84.116.0/23
- 193.84.160.0/20
- 193.84.192.0/19
- 193.84.192.0/20
- 193.84.208.0/20
- 195.113.0.0/16
- 195.178.64.0/19
- 2001:718::/29
Upstreams and peers 63
The networks RIPE RIS sees next to AS2852 in BGP paths, the most visible first.
Peering
Peering policy: Selective. Suggested max-prefix limits: 300 IPv4, 100 IPv6. PeeringDB record
| Exchange | Ports | Speed | Route server |
|---|---|---|---|
| AMS-IX | 1 | 20G | Yes |
| DE-CIX Frankfurt: DE-CIX Frankfurt Peering LAN | 1 | 30G | No |
| NIX.CZ: Public peering VLAN | 2 | 400G | Yes |
More about AS2852
Sources: RIR delegation data and PeeringDB (updated daily); routing from RIPEstat (RIPE NCC RIS and RPKI), refreshed daily. Routing data from 2026-11-14 21:39 UTC. The country is where the AS number was registered, not necessarily where the network operates.