AS2852
Cesnet Z.S.P.O. — cesnet.cz
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Summary
| Country |
 Czechia
|
| Organization | Cesnet Z.S.P.O. |
| Domain | cesnet.cz |
| Number of IPv4 | 850,944 |
| Number of IPv6 | 7.1305× 1029 |
| AS Type | Education |
| Registry | RIPE NCC |
| Allocated | June 22, 2002 (about 23 years ago) |
| Updated | July 25, 2025 (about 3 months ago) |
IP Ranges
AS2852 announces 28 IPv4 ranges and 2 IPv6 ranges.
That's a total of 850,944 IPv4 addresses and 7.1305× 1029 IPv6 addresses.
| Prefix | Organization | Size | Registry | Status |
|---|---|---|---|---|
| 78.128.128.0/17 |
University of Ostrava
|
32,768 | RIPE NCC | ASSIGNED PA |
| 146.102.0.0/16 |
University of Economics, Prague
|
65,536 | RIPE NCC | LEGACY |
| 147.32.0.0/16 |
Ceske Vysoke Uceni Technicke V Praze
|
65,536 | RIPE NCC | LEGACY |
| 147.33.0.0/16 |
Vysoka Skola Chemicko-technologicka V Praze
|
65,536 | RIPE NCC | LEGACY |
| 147.228.0.0/16 |
Zapadoceska Univerzita V Plzni
|
65,536 | RIPE NCC | LEGACY |
| 147.230.0.0/16 |
Technicka Univerzita V Liberci
|
65,536 | RIPE NCC | LEGACY |
| 147.230.17.0/24 |
Technicka Univerzita V Liberci
|
256 | RIPE NCC | LEGACY |
| 147.231.0.0/16 |
Czech Academy of Sciences
|
65,536 | RIPE NCC | LEGACY |
| 147.251.0.0/16 |
Masarykova Univerzita - Ustav Vypocetni Techniky
|
65,536 | RIPE NCC | LEGACY |
| 158.194.0.0/16 |
Univerzita Palackeho V Olomouci
|
65,536 | RIPE NCC | LEGACY |
| 158.196.0.0/16 |
Vysoka Skola Banska - Technicka Univerzita Ostrava
|
65,536 | RIPE NCC | LEGACY |
| 160.216.0.0/16 |
Univerzita Obrany
|
65,536 | RIPE NCC | LEGACY |
| 160.217.0.0/16 |
University of South Bohemia in Ceske Budejovice
|
65,536 | RIPE NCC | LEGACY |
| 185.8.160.0/22 |
Cesnet Z.S.P.O.
|
1,024 | RIPE NCC | ASSIGNED PA |
| 192.108.128.0/24 |
Institute of Organic Chemistry And Biochemistry of The Ascr, V.V.I.
|
256 | RIPE NCC | LEGACY |
| 193.84.32.0/20 |
Czech University of Life Sciences Prague
|
4,096 | RIPE NCC | ASSIGNED PI |
| 193.84.53.0/24 |
Charles University
|
256 | RIPE NCC | ASSIGNED PI |
| 193.84.55.0/24 |
Charles University
|
256 | RIPE NCC | ASSIGNED PI |
| 193.84.56.0/21 |
Charles University
|
2,048 | RIPE NCC | ASSIGNED PI |
| 193.84.80.0/22 |
Cesnet Z.S.P.O.
|
1,024 | RIPE NCC | ASSIGNED PI |
| 193.84.104.0/22 |
Ceske Vysoke Uceni Technicke V Praze
|
1,024 | RIPE NCC | ASSIGNED PI |
| 193.84.116.0/23 |
Institute of Chemical Process Fundamentals of The Ascr, V.V.I.
|
512 | RIPE NCC | ASSIGNED PI |
| 193.84.160.0/20 |
Ujv Rez, A.S.
|
4,096 | RIPE NCC | ASSIGNED PI |
| 193.84.192.0/20 |
Silesian University in Opava
|
4,096 | RIPE NCC | ASSIGNED PI |
| 193.84.208.0/20 |
Silesian University in Opava
|
4,096 | RIPE NCC | ASSIGNED PI |
| 194.50.26.0/23 |
Povodi Labe, S.P.
|
512 | RIPE NCC | ASSIGNED PI |
| 195.113.0.0/16 |
Charles University
|
65,536 | RIPE NCC | ASSIGNED PA |
| 195.178.64.0/19 |
Cesnet Z.S.P.O.
|
8,192 | RIPE NCC | ASSIGNED PA |
| Prefix | Organization | Size | Registry | Status |
|---|---|---|---|---|
| 2001:718::/29 |
Cesnet Z.S.P.O.
|
6.3383× 1029 | RIPE NCC | AGGREGATED-BY-LIR |
| 2001:718::/32 |
Cesnet Z.S.P.O.
|
7.9228× 1028 | RIPE NCC | AGGREGATED-BY-LIR |
Peers
AS2852 actively fosters the following peering relationships that enhance network performance through direct, settlement-free traffic exchange. Even with a modest number of peers, each connection serves as a strategic asset—optimizing routing, reducing latency, and minimizing transit costs.
Upstreams
AS2852 connects to the global Internet via at least 4 upstream providers. In this setup, AS2852 acts as a customer, subscribing to these transit services to obtain full BGP routing information and ensure reliable, redundant access to external networks.
Downstreams
AS2852 serves as a transit provider the following ASes, delivering the BGP routes needed for global connectivity. This downstream relationship underscores AS2852's role in extending Internet access beyond its own infrastructure.