AS number details

AS2852

CESNET z.s.p.o.  ·  cesnet.cz

Czechia

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AS2852 – CESNET z.s.p.o.

Field Value
Country Czechia
Website cesnet.cz
Hosted domains 3,076
Number of IPv4 849,920
Number of IPv6 713,053,462,628,379,038,341,895,553,024
ASN type Education
Registry ripe
Allocated 23 years ago on Jun 22, 2002
Updated 2 months ago on Jul 25, 2025

IP Ranges

Netblock Company Num of IPs
146.102.0.0/16 Vysoka skola ekonomicka v Praze 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
147.32.0.0/16 Prague 65,536
147.33.0.0/16 Praha 6 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
193.84.160.0/20 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
193.84.32.0/20 Ceska zemedelska univerzita v Praze 4,096
193.84.56.0/21 Charles University 2,048
185.8.160.0/22 CESNET z.s.p.o. 1,024
193.84.104.0/22 Czech Technical University 1,024
193.84.80.0/22 Prague 6 1,024
193.84.116.0/23 Institute of Chemical Process Fundamentals of the CAS, v.v.i. 512
147.230.17.0/24 Liberec 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 3,076 domain names hosted across 1,034 IP addresses on this ASN.

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IP Address Domain Domains on this IP
147.251.5.234 ██████████ 151
147.251.5.239 ███████ 117
78.128.246.81 █████████ 88
195.113.89.35 ███████ 66
147.231.163.211 ██████ 65
193.84.206.148 ██████████ 37
195.113.187.197 ██████████ 36
146.102.17.31 ██████████ 35
195.113.2.17 ██████████ 31
195.178.73.178 ██████████ 28

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Peers

There are 204 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.
AS12713 OTEGlobe
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 Provider
AS14907 Wikimedia Foundation Inc.
AS15547 netplus.ch SA
AS15576 NTS workspace AG
AS15605 Connesi s.p.a.
AS15802 Emirates Integrated Telecommunications Company PJSC
AS15958 CETINdoo-NET
AS16019 Vodafone Czech Republic a.s.
AS16509 Amazon.com, Inc.
AS17639 Converge ICT Solutions Inc.
AS18106 Viewqwest Pte Ltd
AS1828 Unitas Global
AS1836 green.ch AG
AS18403 FPT Telecom Company
AS1853 ACONET
AS197277 State Institute for Drug Control
AS197451 Brno University of Technology
AS198150 SIACOM JSC
AS198249 Ops One AG
AS198385 AlpineDC SA
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.
AS20764 CJSC RASCOM
AS208093 Moravskoslezsky kraj
AS20932 Services Industriels de Geneve
AS20965 GEANT Vereniging
AS209823 Enki Multimedia EURL
AS210312 Antonios A. Chariton
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
AS24889 Monzoon Networks AG
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
AS264409 GRUPO YAX
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
AS2914 NTT America, Inc.
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
AS31133 PJSC MegaFon
AS31510 Innsbrucker Kommunalbetriebe AG
AS3212 Telemach Slovenija d.o.o.
AS3214 xTom GmbH
AS3216 PJSC "Vimpelcom"
AS3333 Reseaux IP Europeens Network Coordination Centre (RIPE NCC)
AS33891 Core-Backbone GmbH
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Upstreams

There are 6 upstreams for this ASN.

upstreams Name
AS2914 NTT America, Inc.
AS49025 PRO-ZETA a.s.
AS60606 PRO-ZETA a.s.
AS6461 Zayo Bandwidth
AS6762 TELECOM ITALIA SPARKLE S.p.A.
AS6939 Hurricane Electric LLC
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Downstreams

There are 16 downstreams for this ASN.

Downstreams Name
AS197277 State Institute for Drug Control
AS197451 Brno University of Technology
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
AS51727 Doosan Skoda Power s.r.o
AS61110 Sprava informacnich technologii mesta Plzne, p.o.
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Pingable IPs

2 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. 3.47ms from Prague, CZ
195.113.158.60 AS2852 CESNET z.s.p.o. 1.11ms 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
135.129.252.36 AS14593 Space Exploration Technologies Corporation 0.12ms from Ashburn, US
98.204.181.4 AS7922 Comcast Cable Communications, LLC 5.46ms from Ashburn, US
125.38.40.244 AS4837 CHINA UNICOM China169 Backbone 5.17ms from Beijing, CN
177.40.16.84 AS18881 TELEFÔNICA BRASIL S.A 2.24ms from Belo Horizonte, BR
173.91.159.4 AS10796 Charter Communications Inc 19.04ms from Chicago, US
213.181.54.4 AS5432 Proximus NV 4.44ms from Gravelines, FR
14.215.123.100 AS4134 CHINANET-BACKBONE 3.10ms from Guangzhou, CN
14.166.128.84 AS45899 VNPT Corp 6.15ms from Hanoi, VN
109.162.76.20 AS15895 "Kyivstar" PJSC 0.86ms from Kyiv, UA
81.136.21.84 AS2856 British Telecommunications PLC 4.82ms from London, GB
80.69.131.52 AS5413 Wavenet Limited 0.62ms from London, GB
34.8.51.164 AS396982 Google LLC 0.08ms from Melbourne, AU
104.196.223.244 AS396982 Google LLC 0.17ms from Moncks Corner, US
185.135.236.116 AS48213 ABICOM SAS 0.73ms from Paris, FR
73.167.6.36 AS7922 Comcast Cable Communications, LLC 9.32ms from Providence, US
98.210.246.148 AS7922 Comcast Cable Communications, LLC 6.36ms from San Jose, US
101.86.226.84 AS4812 China Telecom (Group) 1.73ms from Shanghai, CN
218.17.100.52 AS4134 CHINANET-BACKBONE 2.72ms from Shenzhen, CN
94.52.104.52 AS48161 NEXTGEN COMMUNICATIONS SRL 5.36ms from Timisoara, RO
39.98.191.4 AS37963 Hangzhou Alibaba Advertising Co.,Ltd. 0.66ms from Zhangjiakou, CN
73.201.208.100 AS7922 Comcast Cable Communications, LLC 12.12ms from Ashburn, US
20.25.39.148 AS8075 Microsoft Corporation 0.45ms from Ashburn, US
3.20.80.4 AS16509 Amazon.com, Inc. 7.71ms from Chicago, US
90.21.145.36 AS3215 Orange S.A. 12.83ms from Frankfurt am Main, DE
195.82.46.4 AS8375 Telehouse Deutschland GmbH 0.35ms from Frankfurt am Main, DE

Related Networks

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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