Autonomous System details

AS2852

CESNET z.s.p.o. · cesnet.cz

Czechia

BitTorrent

Crawler

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AS2852 – CESNET z.s.p.o.

Field	Value
Country	Czechia
Website	cesnet.cz
Hosted domains	3,124
IPv4 addresses	849,920
IPv6 addresses	713,053,462,628,379,038,341,895,553,024
ASN type	Education
Registry	ripe
Allocated	24 years ago on Jun 22, 2002
Updated	a month ago on Dec 14, 2025

Netblock	Company	Num of IPs
146.102.0.0/16	Vysoka skola ekonomicka v Praze	65,536
147.32.0.0/16	Prague	65,536
147.33.0.0/16	Praha 6	65,536
147.228.0.0/16	Plzen	65,536
147.230.0.0/16	Liberec	65,536
147.231.0.0/16	Praha	65,536
147.251.0.0/16	Brno	65,536
158.194.0.0/16	Univerzita Palackeho	65,536
158.196.0.0/16	VSB - Technical University	65,536
160.216.0.0/16	Univerzita obrany	65,536
160.217.0.0/16	University of South Bohemia	65,536
195.113.0.0/16	CESNET z.s.p.o.	65,536
78.128.128.0/17	CESNET z.s.p.o.	32,768
193.84.192.0/19	Slezska univerzita v Opave	8,192
195.178.64.0/19	CESNET z.s.p.o.	8,192
193.84.32.0/20	Ceska zemedelska univerzita v Praze	4,096
193.84.160.0/20	UJV Rez, a.s.	4,096
193.84.192.0/20	Slezska univerzita v Opave	4,096
193.84.208.0/20	Slezska univerzita v Opave	4,096
193.84.56.0/21	Charles University	2,048
185.8.160.0/22	CESNET z.s.p.o.	1,024
193.84.80.0/22	Prague 6	1,024
193.84.104.0/22	Czech Technical University	1,024
193.84.116.0/23	Institute of Chemical Process Fundamentals of the CAS, v.v.i.	512
147.251.49.0/24	Brno	256
193.84.53.0/24	Charles University	256
193.84.55.0/24	Charles University	256

Netblock	Company
2001:718::/29	CESNET z.s.p.o.
2001:718::/32	CESNET z.s.p.o.

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WHOIS Details

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                                                ASHandle:       AS2852
                                                OrgID:          AS2852
                                                ASName:         AS2852
                                                ASNumber:       AS2852
                                                RegDate:        0000-00-00
                                                Updated:        0000-00-00
                                                TechHandle:     AA00-AAAA
                                                Source:         AAAA

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Hosted Domains

There are 3,124 domain names hosted across 1,046 IP addresses on this ASN.

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IP Address	Domain	Domains on this IP
147.251.5.234	████████	156
147.251.5.239	███████	120
78.128.246.81	█████████	105
195.113.89.35	███████	68
147.231.163.211	██████	65
78.128.248.13	████████	37
193.84.206.148	██████████	37
195.113.187.197	██████████	36
146.102.17.31	████████	33
195.113.2.17	██████████	31

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Peers

There are 191 peers for this ASN.

Peers	Name
AS1031	PEER 1031 LLC
AS1103	SURF B.V.
AS1140	Stichting Internet Domeinregistratie Nederland
AS12552	GlobalConnect AB
AS12637	SEEWEB s.r.l.
AS1267	WIND TRE S.P.A.
AS12779	IT.Gate S.p.A.
AS12859	BIT BV
AS12969	Vodafone Iceland
AS13030	Init7 (Switzerland) Ltd.
AS13058	serve-u - Buchholz und Suenderhauf GbR
AS132337	Axclusive
AS13237	euNetworks GmbH
AS137409	GSL Networks Pty LTD
AS142271	EWS DS Networks Inc
AS14537	Continent 8 LLC
AS14630	Invesco Group Services, Inc.
AS14840	BR.Digital Telecom
AS14907	Wikimedia Foundation Inc.
AS15547	netplus.ch SA
AS15605	Connesi s.p.a.
AS15958	CETINdoo-NET
AS16019	Vodafone Czech Republic a.s.
AS16509	Amazon.com, Inc.
AS18106	Viewqwest Pte Ltd
AS1828	Unitas Global
AS1836	green.ch AG
AS1853	ACONET
AS197277	State Institute for Drug Control
AS197451	Brno University of Technology
AS198150	SIACOM JSC
AS198249	Ops One AG
AS198385	AlpineDC SA
AS198500	Masarykova univerzita - Ustav vypocetni techniky
AS199524	G-Core Labs S.A.
AS199604	OLOMOUCKY KRAJ
AS199711	National Cyber and Information Security Agency
AS199938	Netzwerge GmbH
AS200874	Liberecky kraj
AS201648	Plzensky kraj
AS202297	Skylon Solutions Limited
AS202874	Zlinsky Kraj
AS204772	Reditelstvi silnic a dalnic s.p.
AS20485	Joint Stock Company TransTeleCom
AS205112	PHILUNET GmbH
AS20562	Broadband Hosting B.V.
AS206356	Freifunk Essen e.V.
AS20723	AVONET, s.r.o.
AS20764	CJSC RASCOM
AS208093	Moravskoslezsky kraj
AS20932	Services Industriels de Geneve
AS20965	GEANT Vereniging
AS209823	Enki Multimedia EURL
AS210367	Krajska zdravotni, a.s.
AS210498	Kraj Vysocina
AS210937	Xiufeng Guo
AS2119	Telenor Norge AS
AS212483	LEVEL EIGHTY-SIX COMMUNICATIONS LTD
AS212876	Pardubicky Kraj
AS213151	Christian Elsen
AS213152	Narodni bezpecnostni urad Czech Republic
AS21320	GEANT Vereniging
AS213241	TECHIT.BE SRL
AS21412	UAB "Cgates"
AS22356	Durand do Brasil Ltda
AS24482	SG.GS
AS24961	WIIT AG
AS25091	IP-Max SA
AS25160	Vorboss Limited
AS25220	equada network GmbH
AS2607	Zdruzenie pouzivatelov Slovenskej akademickej datovej siete SANET
AS263152	MIGO TELECOM
AS263444	Open X Tecnologia Ltda
AS2686	AT&T Enterprises, LLC
AS271253	LINK BRASIL TELECOMUNICACOES LTDA
AS28716	Retelit Digital Services S.p.A.
AS28917	Fiord Networks, UAB
AS29049	Delta Telecom Ltd
AS29075	IELO Main Network
AS29140	Hostserver GmbH
AS29504	Freenet Liberec, z.s.
AS29632	Netassist International EOOD
AS29691	Nine Internet Solutions AG
AS30781	Free Pro SAS
AS30844	Liquid Telecommunications Ltd
AS31027	GlobalConnect A/S
AS31510	Innsbrucker Kommunalbetriebe AG
AS3212	Telemach Slovenija d.o.o.
AS3214	xTom GmbH
AS3216	PJSC "Vimpelcom"
AS32590	Valve Corporation
AS3333	Reseaux IP Europeens Network Coordination Centre (RIPE NCC)
AS33891	Core-Backbone GmbH
AS34019	Hivane Association
AS34080	MIRAMO spol. s.r.o.
AS34177	CELESTE SAS
AS34288	Kantonsschule Zug
AS34549	meerfarbig GmbH & Co. KG
AS34927	iFog GmbH
AS35280	F5 Networks SARL

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ASN API & Database

Upstreams

There are 5 upstreams for this ASN.

upstreams	Name
AS21320	GEANT Vereniging
AS60606	PRO-ZETA a.s.
AS6461	Zayo Bandwidth
AS6762	TELECOM ITALIA SPARKLE S.p.A.
AS6939	Hurricane Electric LLC

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ASN API & Database

Downstreams

There are 16 downstreams for this ASN.

Downstreams	Name
AS197277	State Institute for Drug Control
AS197451	Brno University of Technology
AS198500	Masarykova univerzita - Ustav vypocetni techniky
AS199604	OLOMOUCKY KRAJ
AS199711	National Cyber and Information Security Agency
AS200874	Liberecky kraj
AS201648	Plzensky kraj
AS202874	Zlinsky Kraj
AS204772	Reditelstvi silnic a dalnic s.p.
AS208093	Moravskoslezsky kraj
AS210367	Krajska zdravotni, a.s.
AS210498	Kraj Vysocina
AS212876	Pardubicky Kraj
AS213152	Narodni bezpecnostni urad Czech Republic
AS48091	Kraj Vysocina
AS61110	Sprava informacnich technologii mesta Plzne, p.o.

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ASN API & Database

Pingable IPs

3 IPs in this ASN replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
2001:718:0:c003::2	AS2852 CESNET z.s.p.o.	`3.49ms` from Prague, CZ
147.228.58.34	AS2852 CESNET z.s.p.o.	`1.84ms` from Prague, CZ
195.113.158.60	AS2852 CESNET z.s.p.o.	`0.97ms` from Prague, CZ

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address	ASN	Details
96.231.200.100	AS701 Verizon Business	`2.67ms` from Ashburn, US
58.171.225.68	AS1221 Telstra Limited	`2.69ms` from Brisbane, AU
103.249.238.212	AS133159 Mammoth Media Pty Ltd	`0.21ms` from Brisbane, AU
213.181.54.4	AS5432 Proximus NV	`1.58ms` from Brussels, BE
173.91.159.4	AS10796 Charter Communications Inc	`11.41ms` from Columbus, US
70.28.245.4	AS577 Bell Canada	`5.55ms` from Edmonton, CA
88.238.157.84	AS47331 TTNet A.S.	`8.06ms` from Istanbul, TR
196.31.183.52	AS16637 MTN SA	`1.44ms` from Johannesburg, ZA
97.218.101.196	AS6167 Verizon Business	`13.81ms` from Los Angeles, US
203.47.30.132	AS1221 Telstra Limited	`1.03ms` from Melbourne, AU
35.252.59.116	AS396982 Google LLC	`6.44ms` from Riyadh, SA
20.165.19.228	AS8075 Microsoft Corporation	`0.20ms` from San Antonio, US
50.46.107.4	AS20055 Wholesail networks LLC	`3.05ms` from Seattle, US
121.166.159.36	AS4766 Korea Telecom	`1.36ms` from Seoul, KR
118.47.82.180	AS4766 Korea Telecom	`7.28ms` from Seoul, KR
61.193.55.148	AS2518 BIGLOBE Inc.	`2.33ms` from Tokyo, JP
128.100.100.4	AS239 University of Toronto	`0.74ms` from Toronto, CA
145.107.133.132	AS1103 SURF B.V.	`3.46ms` from Amsterdam, NL
128.239.141.4	AS11975 The College of William and Mary	`7.63ms` from Ashburn, US
128.146.159.244	AS159 Ohio State University	`6.01ms` from Columbus, US
71.128.7.116	AS7018 AT&T Enterprises, LLC	`3.26ms` from Dallas, US
98.71.49.84	AS8075 Microsoft Corporation	`0.15ms` from Dublin, IE
2.206.187.132	AS3209 Vodafone GmbH	`3.05ms` from Hamburg, DE
86.173.174.4	AS2856 British Telecommunications PLC	`2.21ms` from London, GB
138.100.208.196	AS766 RedIRIS Autonomous System	`1.00ms` from Madrid, ES

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What is an ASN?

Autonomous System Numbers (ASNs) are assigned to entities such as Internet Service Providers and other large organizations that control blocks of IP addresses. This network page, and the organization field that's shown on the main IP address information page and also returned in the geolocation API are based on the ASN.

The ASN details will often correspond to the IP address owner, but for smaller organizations it may be that organization's parent, or their ISP. Find out more about AS2852 at robtex.

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