AS2852 CESNET z.s.p.o. 🇨🇿 CZ

Announcing 27 prefixes, seen at the RIS collectors.

IPv4 prefixes

858,112 (3,352 × /24)

IPv6 prefixes

8 × /32

Upstreams

transit providers observed

Peers

settlement-free adjacencies

Downstreams

transit customers observed

Customer cone

ASes reachable through it

Registry and operator data

AS number: AS2852
Name: CESNET z.s.p.o.
Organisation: CESNET
Country: 🇨🇿 CZ
RIR: RIPENCC
Allocated: 1993-12-20
Network type: Educational/Research
Traffic levels: 500-1000Gbps
Scope: Europe
Peering policy: Selective
IRR as-set: AS2852:AS-CESNET-GOOGLE
Website: https://www.cesnet.cz
Looking glass: https://lg.cesnet.cz
PeeringDB: net/660
Exchanges: 3

RPKI coverage of this AS

Its own announcements, validated against the current ROA set

27 valid (100.0%) 0 invalid (0.0%) 0 no ROA (0.0%)

Upstreams

Networks seen providing transit to this one

Network	Country	Cone	IPv4 prefixes	Paths	Source
AS174 Cogent Communications, LLC	🇺🇸 US	65,622	3,989	525	inferred
AS21320 GEANT Vereniging	🇳🇱 NL	926	1	417	CAIDA
AS20965 GEANT Vereniging	🇳🇱 NL	904	2	68	CAIDA
AS17639 Converge ICT Solutions Inc.	🇵🇭 PH	274	567	41	inferred
AS29632 Netassist International EOOD	🇧🇬 BG	45	0	15	inferred
AS60606 PRO-ZETA a.s.	🇨🇿 CZ	38	6	69	CAIDA
AS213241 TECHIT.BE SRL	🇧🇪 BE	0	14	13	inferred
AS56662 Marcin Gondek	🇵🇱 PL	0	0	3	inferred
AS212024 Marc Schmitt	🇫🇷 FR	0	1	1	inferred

Peers

Adjacencies that look settlement-free rather than transit

Network	Country	Cone	IPv4 prefixes	Paths	Source
AS6939 Hurricane Electric LLC	🇺🇸 US	53,176	185	775	CAIDA
AS6461 Zayo Bandwidth	🇺🇸 US	50,756	214	95	CAIDA
AS20485 TransTeleCom JSC	🇷🇺 RU	28,520	85	52	CAIDA
AS33891 Core-Backbone GmbH	🇩🇪 DE	24,977	1	2	CAIDA
AS37721 Virtual Technologies & Solutions	🇧🇫 BF	21,692	64	59	CAIDA
AS50673 Serverius Holding B.V.	🇳🇱 NL	16,116	131	27	CAIDA
AS34549 meerfarbig GmbH & Co. KG	🇩🇪 DE	15,608	48	180	CAIDA
AS34927 iFog GmbH	🇨🇭 CH	15,499	38	26	CAIDA
AS24482 SG.GS	🇸🇬 SG	4,776	45	180	CAIDA
AS8218 Zayo Europe	🇫🇷 FR	342	19	26	CAIDA
AS16019 Vodafone Czech Republic a.s.	🇨🇿 CZ	159	90	5	CAIDA
AS12779 IT.Gate S.p.A.	🇮🇹 IT	76	25	5	CAIDA
AS1853 ACONET	🇦🇹 AT	69	17	184	CAIDA
AS1836 green.ch AG	🇨🇭 CH	44	78	7	CAIDA
AS34019 Hivane Association	🇫🇷 FR	38	6	1	CAIDA
AS12859 BIT BV	🇳🇱 NL	38	66	1	CAIDA
AS20766 Association "Gitoyen"	🇫🇷 FR	18	6	26	CAIDA
AS48362 Stadtwerke Feldkirch	🇦🇹 AT	16	8	29	CAIDA
AS48185 team.blue NV	🇧🇪 BE	14	1	26	CAIDA
AS50300 CustodianDC Limited	🇬🇧 GB	9	39	27	CAIDA
AS202297 Skylon Solutions Limited	🇬🇧 GB	2	2	2	CAIDA
AS29504 Freenet Liberec, z.s.	🇨🇿 CZ	0	1	194	CAIDA
AS3333 Reseaux IP Europeens Network Coordination Centre (RIPE NCC)	🇳🇱 NL	0	7	27	CAIDA
AS20723 AVONET, s.r.o.	🇨🇿 CZ	0	7	10	CAIDA

Downstreams

Networks this one appears to provide transit to

Network	Country	Cone	IPv4 prefixes	Paths	Source
AS197451 Brno University of Technology	🇨🇿 CZ	13	8	201	CAIDA
AS2607 Zdruzenie pouzivatelov Slovenskej akademickej datovej siete SANET	🇸🇰 SK	3	33	78	CAIDA
AS48091 Kraj Vysocina	🇨🇿 CZ	0	3	199	CAIDA
AS208093 Moravskoslezsky kraj	🇨🇿 CZ	0	5	188	CAIDA
AS197277 State Institute for Drug Control	🇨🇿 CZ	0	3	165	CAIDA
AS199711 National Cyber and Information Security Agency	🇨🇿 CZ	0	2	154	CAIDA
AS201648 Plzensky kraj	🇨🇿 CZ	0	2	123	CAIDA
AS213152 Narodni bezpecnostni urad Czech Republic	🇨🇿 CZ	0	2	96	CAIDA
AS61110 Sprava informacnich technologii mesta Plzne, p.o.	🇨🇿 CZ	0	3	88	CAIDA
AS202874 Zlinsky Kraj	🇨🇿 CZ	0	1	81	CAIDA
AS200874 Liberecky kraj	🇨🇿 CZ	0	1	81	CAIDA
AS212876 Pardubicky Kraj	🇨🇿 CZ	0	1	81	CAIDA
AS210498 Kraj Vysocina	🇨🇿 CZ	0	1	79	CAIDA
AS210367 Krajska zdravotni, a.s.	🇨🇿 CZ	0	1	69	CAIDA
AS204772 Reditelstvi silnic a dalnic s.p.	🇨🇿 CZ	0	1	46	CAIDA
AS51727 Doosan Skoda Power s.r.o	🇨🇿 CZ	0	1	40	CAIDA
AS198500 Masarykova univerzita - Ustav vypocetni techniky	🇨🇿 CZ	0	1	34	CAIDA
AS199604 OLOMOUCKY KRAJ	🇨🇿 CZ	0	1	15	CAIDA

Relationships marked inferred come from where the two networks sit on the AS paths the collectors see, which is a guess and is wrong for some of them. The rest are stated by CAIDA's published inference over a much wider set of collectors.