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iamroot.tech
Internet tools
DNS lookup
DNS propagation check
Port scan + probeing
WHOIS / RDAP lookup
HTTP/S request tool
TLS/SSL certificate check
beta
E-mail DNSBL blacklist check
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CIDR calculator
beta
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beta
What is my IPv4 and IPv6?
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Color contrast checker
Color picker
Lorem ipsum generator
URL encode/decode
HTML encode/decode
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Misc tools
Password generator
World map, day/night + local time
beta
Internet tools
DNS lookup
DNS propagation check
Port scan + probeing
WHOIS / RDAP lookup
HTTP/S request tool
TLS/SSL certificate check
beta
E-mail DNSBL blacklist check
Reverse DNS
CIDR calculator
beta
ASN database lookup
beta
What is my IPv4 and IPv6?
GeoIP location
QR code generator
Dev tools
Color contrast checker
Color picker
Lorem ipsum generator
URL encode/decode
HTML encode/decode
BASE64 encode/decode
Hash calculator (CRC64 - MD5 - SHA - RIPEMD)
Misc tools
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World map, day/night + local time
beta
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Result
AS2852, CESNET z.s.p.o.
Last update of data:
23-04-2024 21:08 UTC
ASN:
AS2852 (CESNET2)
Country:
CZ - Czech Republic (Europe)
Org.:
CESNET z.s.p.o.
https://www.cesnet.cz
LookingGlass
http://www.ces.net/
@PeeringDB
Social media:
@facebook
@instagram
@twitter/X
Stats:
Peers
224
IX'es
2
Prefixes
21
IPv4
+848K
IPv6
6,3E+29
Contact:
CESNET z.s.p.o.
Generla Pky 430/26, Dejvice
160 00
Praha 6
CZECH REPUBLIC
CZ
+420 602 252 531
Statistics
Continent
Peers
IX'es
Prefixes
IPv4
IPv6
North America
17
-
-
-
-
South America
9
-
-
-
-
Europe
174
2
21
+848K
6,3E+29
Africa
4
-
-
-
-
Asia
18
-
-
-
-
Oceania
1
-
-
-
-
Antartica
-
-
-
-
-
Unknown
1
-
-
-
-
In total
224
2
21
+848K
6,3E+29
History
Date
Peers
IX'es
Prefixes
IPv4
IPv6
Before 25-11-2023
225
2
21
+848K
6,3E+29
25-11-2023
-14
-
-
-
-
02-12-2023
+3
-
-
-
-
09-12-2023
-1
-
-
-
-
17-12-2023
+3
-
-
-
-
25-12-2023
+1
-
-
-
-
01-01-2024
+1
-
-
-
-
08-01-2024
+4
-
-
-
-
15-01-2024
-91
-
-
-
-
22-01-2024
+91
-
-
-
-
29-01-2024
-5
-
-
-
-
05-02-2024
+6
-
-
-
-
12-02-2024
-1
-
-
-
-
19-02-2024
+3
-
-
-
-
26-02-2024
-5
-
-
-
-
04-03-2024
+2
-
-
-
-
12-03-2024
+1
-
-
-
-
19-03-2024
+5
-
-
-
-
26-03-2024
-7
-
-
-
-
02-04-2024
+7
-
-
-
-
09-04-2024
+8
-
-
-
-
16-04-2024
-13
-
-
-
-
23-04-2024
+1
-
-
-
-
Current
224
2
21
+848K
6,3E+29
- - show more (+18 entries) - -
- - show less (-18 entries) - -
Peers
Country
Relationship
ASN
Organization
Peers
Prefix'es
Angola
Upstream
AS37468
Angola Cables
2.237
10
Australia
Peer
AS8888
xTom Pty Ltd
1.451
39
Austria
Upstream
AS48362
Stadtwerke Feldkirch
1.677
8
Austria
Upstream
AS1764
Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH
981
80
Austria
Upstream
AS47147
ANEXIA Internetdienstleistungs GmbH
1.357
5
Austria
Peer
AS59890
Kabel-TV Lampert GmbH & Co KG
1.419
6
Austria
Peer
AS40994
Hohl IT e.U.
381
11
Austria
Peer
AS51184
Fonira Telekom GmbH
1.304
14
Austria
Downstream
AS1853
ACONET
134
19
Azerbaijan
Peer
AS29049
Delta Telecom Ltd
2.919
183
Bahrain
Peer
AS59605
MENA LEVANT W.L.L
1.549
19
Brazil
Upstream
AS61568
ALOO TELECOM - FSF TECNOLOGIA SA
2.239
12
Brazil
Peer
AS271253
LINK BRASIL TELECOMUNICACOES LTDA
5.084
18
Brazil
Peer
AS263152
MIGO TELECOM
3.195
6
Brazil
Peer
AS14840
BR.Digital Provider
5.146
89
Brazil
Downstream
AS11284
Ncleo de Inf. e Coord. do Ponto BR - NIC.BR
53
2
Brazil
Downstream
AS11644
Ncleo de Inf. e Coord. do Ponto BR - NIC.BR
37
4
Brazil
Downstream
AS10906
Ncleo de Inf. e Coord. do Ponto BR - NIC.BR
37
4
Britain (UK)
Upstream
AS9002
RETN Limited
3.248
37
Britain (UK)
Upstream
AS4455
IX Reach Ltd
2.344
18
Britain (UK)
Peer
AS50300
CustodianDC Limited
1.100
54
Britain (UK)
Peer
AS50763
MCKAYCOM LTD
700
8
Britain (UK)
Peer
AS212483
LEVEL EIGHTY-SIX COMMUNICATIONS LTD
3.263
32
Britain (UK)
Peer
AS41095
IPTP LTD
1.352
102
Britain (UK)
Peer
AS202297
Skylon Solutions Limited
38
7
Britain (UK)
Peer
AS25160
Vorboss Limited
1.965
37
Burkina Faso
Peer
AS37721
Virtual Technologies & Solutions
4.635
10
Colombia
Upstream
AS52320
GlobeNet Cabos Submarinos Colombia, S.A.S.
2.120
6
Czech Republic
Upstream
AS49025
PRO-ZETA a.s.
95
5
Czech Republic
Peer
AS29504
Freenet Liberec, z.s.
288
2
Czech Republic
Peer
AS6881
NIX.CZ z.s.p.o.
198
5
Czech Republic
Downstream
AS25512
CD-Telematika a.s.
47
14
Czech Republic
Downstream
AS48451
Prazska energetika, a.s.
20
2
Czech Republic
Downstream
AS204860
NetX Networks a.s.
24
14
Czech Republic
Downstream
AS215704
NGN CZ s.r.o.
19
1
Czech Republic
Downstream
AS58239
hanspaul-city.net s.r.o.
20
3
Czech Republic
Downstream
AS215582
Jan Kalista
10
1
Czech Republic
Downstream
AS212876
Pardubicky Kraj
2
2
Czech Republic
Downstream
AS197277
State Institute for Drug Control
2
2
Czech Republic
Downstream
AS197451
Brno University of Technology
12
10
Czech Republic
Downstream
AS199604
OLOMOUCKY KRAJ
2
2
Czech Republic
Downstream
AS199711
National Cyber and Information Security Agency
2
3
Czech Republic
Downstream
AS200874
Liberecky kraj
1
2
Czech Republic
Downstream
AS201648
Plzensky kraj
1
3
Czech Republic
Downstream
AS202874
Zlinsky Kraj
1
2
Czech Republic
Downstream
AS204772
Reditelstvi silnic a dalnic s.p.
18
2
Czech Republic
Downstream
AS208093
Moravskoslezsky kraj
2
2
Czech Republic
Downstream
AS210367
Krajska zdravotni, a.s.
1
3
Czech Republic
Downstream
AS210498
Kraj Vysocina
1
2
Czech Republic
Downstream
AS213152
Narodni bezpecnostni urad Czech Republic
2
3
Czech Republic
Downstream
AS48091
Kraj Vysocina
3
4
Czech Republic
Downstream
AS61110
Sprava informacnich technologii mesta Plzne, p.o.
2
2
Czech Republic
Downstream
AS15935
ha-vel internet s.r.o.
78
12
Czech Republic
Downstream
AS201730
Cloud4com s.r.o.
21
10
Czech Republic
Downstream
AS202877
VEJNET.CZ s.r.o.
28
3
Czech Republic
Downstream
AS207153
Stream-iT, s.r.o.
19
1
Czech Republic
Downstream
AS209719
Ministerstvo Obrany
18
1
Czech Republic
Downstream
AS25234
ACTIVE 24, s.r.o.
24
8
Czech Republic
Downstream
AS43541
VSHosting s.r.o.
21
16
Czech Republic
Downstream
AS29134
Webglobe, s.r.o.
25
12
Czech Republic
Downstream
AS29086
GiTy, a.s.
21
2
Czech Republic
Downstream
AS203165
Statni pokladna Centrum sdilenych sluzeb, s.p.
20
2
Czech Republic
Downstream
AS202605
EMPECOM, s.r.o.
19
2
Czech Republic
Downstream
AS199405
Oslavany.NET, spolek
18
2
Czech Republic
Downstream
AS47232
ISP Alliance a.s.
115
19
Czech Republic
Downstream
AS31349
a-net Liberec s.r.o.
19
3
Czech Republic
Downstream
AS34080
MIRAMO spol. s.r.o.
22
5
Czech Republic
Downstream
AS59747
NIX.CZ z.s.p.o.
21
1
Czech Republic
Downstream
AS35361
GREPA Networks s.r.o.
20
3
Czech Republic
Downstream
AS35592
Coolhousing s.r.o.
23
5
Czech Republic
Downstream
AS8913
Mopos Communications A.S.
19
2
Czech Republic
Downstream
AS210111
Netcraft Solutions s.r.o.
20
2
Czech Republic
Downstream
AS198605
AVAST Software s.r.o.
31
76
Czech Republic
Downstream
AS51800
FIBER Network s.r.o.
20
2
Czech Republic
Downstream
AS199657
TNtech, s.r.o.
10
5
Czech Republic
Downstream
AS50698
TETA s.r.o.
23
4
Czech Republic
Downstream
AS28892
Cesky urad zememericky a katastralni
20
2
Czech Republic
Downstream
AS39904
MERIT GROUP a.s
24
4
Czech Republic
Downstream
AS16246
Nej.cz s.r.o.
41
19
Czech Republic
Downstream
AS15685
CASABLANCA INT a.s.
31
59
Czech Republic
Downstream
AS42000
Futruy s.r.o.
82
7
Czech Republic
Downstream
AS43413
NEW TELEKOM, spol. s r.o.
22
3
Czech Republic
Downstream
AS43708
METRONET s.r.o.
36
6
Czech Republic
Downstream
AS43709
SilesNet s.r.o.
30
2
Czech Republic
Downstream
AS201594
Czech Telecommunication Office
18
2
Czech Republic
Downstream
AS16019
Vodafone Czech Republic a.s.
119
59
Czech Republic
Downstream
AS201163
Komercni banka, a.s.
20
3
Czech Republic
Downstream
AS59984
KLFREE NETWORKS, s.r.o.
23
2
Czech Republic
Downstream
AS47110
Cloud4com s.r.o.
21
6
Czech Republic
Downstream
AS8251
FreeTel, s.r.o.
41
7
Czech Republic
Downstream
AS213387
TeSuNet s.r.o.
19
1
Czech Republic
Downstream
AS25192
CZ.NIC, z.s.p.o.
169
14
Czech Republic
Downstream
AS35236
2 connect a.s.
34
12
Czech Republic
Downstream
AS25248
RADIOKOMUNIKACE a.s.
63
6
Czech Republic
Downstream
AS39790
Web4U s.r.o.
20
3
Czech Republic
Downstream
AS50695
VLTAVA LABE MEDIA a.s.
20
3
Czech Republic
Downstream
AS39817
OvaNet, a.s.
20
4
Czech Republic
Downstream
AS5610
O2 Czech Republic, a.s.
63
41
Czech Republic
Downstream
AS28725
CETIN a.s.
208
7
Czech Republic
Downstream
AS20723
AVONET, s.r.o.
20
8
Czech Republic
Downstream
AS25424
InterneXt 2000, s.r.o.
24
9
Czech Republic
Downstream
AS47868
SUPRO, spol. s r.o.
19
3
Czech Republic
Downstream
AS43542
OptoNet Communication, spol. s.r.o.
26
3
Czech Republic
Downstream
AS208060
Dr. Max BDC, s.r.o.
18
2
Czech Republic
Downstream
AS199803
ComSource s.r.o.
34
3
Czech Republic
Downstream
AS56344
Viridium.cz s.r.o.
18
5
Czech Republic
Downstream
AS60592
Gransy s.r.o.
29
22
Denmark
Peer
AS42541
Fiberby ApS
1.519
6
Finland
Peer
AS6667
Elisa Oyj
464
5
France
Upstream
AS29075
IELO-LIAZO SERVICES SAS
1.929
22
France
Upstream
AS34019
Hivane Association
1.796
10
France
Upstream
AS35280
F5 Networks SARL
5.648
35
France
Upstream
AS8218
Zayo Infrastructure France SA
1.854
24
France
Upstream
AS29169
GANDI SAS
201
8
France
Peer
AS34177
CELESTE SAS
1.463
57
Germany
Upstream
AS24961
WIIT AG
1.637
54
Germany
Upstream
AS33891
Core-Backbone GmbH
1.902
-
Germany
Peer
AS29140
Hostserver GmbH
1.175
3
Germany
Peer
AS25220
equada network GmbH
1.333
19
Germany
Peer
AS5405
Inter.link GmbH
1.895
5
Germany
Peer
AS13237
euNetworks GmbH
2.316
32
Germany
Peer
AS199938
Netzwerge GmbH
1.094
8
Global
Upstream
AS21320
DANTE-MNT
151
2
Hong Kong
Downstream
AS23764
China Telecom Global Limited
538
147
Iceland
Peer
AS12969
Ljosleidarinn ehf
1.027
24
India
Upstream
AS9498
Bharti Airtel Limited
3.153
533
Iran
Upstream
AS20965
DANTE-MNT
72
3
Ireland
Peer
AS39122
Blacknight Internet Solutions Limited
1.207
29
Ireland
Peer
AS31122
Digiweb ltd
1.029
50
Israel
Downstream
AS13150
CATO NETWORKS LTD
309
153
Italy
Upstream
AS12779
IT.Gate S.p.A.
2.018
25
Italy
Upstream
AS6762
TELECOM ITALIA SPARKLE S.p.A.
650
79
Italy
Peer
AS49605
Digital Telecommunication Services S.r.l.
1.429
8
Italy
Peer
AS51185
MainStreaming SpA
3.576
30
Italy
Peer
AS15605
Connesi s.p.a.
1.443
14
Italy
Peer
AS12637
SEEWEB s.r.l.
1.001
56
Lithuania
Upstream
AS13194
UAB "Bite Lietuva"
878
87
Lithuania
Peer
AS28917
Fiord Networks, UAB
2.008
23
Luxembourg
Peer
AS199524
G-Core Labs S.A.
5.318
451
Mauritius
Upstream
AS37100
SEACOM Limited
1.642
13
Netherlands
Upstream
AS6777
Amsterdam Internet Exchange B.V.
543
-
Netherlands
Upstream
AS20562
Broadband Hosting B.V.
1.353
-
Netherlands
Upstream
AS1103
AS1103-MNT
1.073
95
Netherlands
Upstream
AS8315
Accenture B. V.
287
60
Netherlands
Upstream
AS50673
Serverius Holding B.V.
1.191
83
Netherlands
Upstream
AS8283
Netwerkvereniging Coloclue
1.192
6
Netherlands
Upstream
AS15830
Equinix (EMEA) Acquisition Enterprises B.V.
2.928
547
Netherlands
Upstream
AS29396
Eurofiber Nederland BV
345
13
Netherlands
Peer
AS3333
Reseaux IP Europeens Network Coordination Centre (RIPE NCC)
855
7
Netherlands
Peer
AS49544
i3D.net B.V
6.668
134
Netherlands
Peer
AS41047
Bart Vrancken trading as MLaB
3.003
5
Netherlands
Peer
AS34288
KSZ-CH-MNT
1.657
7
Netherlands
Peer
AS15435
DELTA Fiber Nederland B.V.
1.025
20
Netherlands
Peer
AS1140
Stichting Internet Domeinregistratie Nederland
854
4
Netherlands
Peer
AS12859
BIT BV
1.061
61
Netherlands
Downstream
AS20940
Akamai International B.V.
527
201
Norway
Upstream
AS56655
TerraHost AS
712
24
Norway
Upstream
AS2119
Telenor Norge AS
667
199
Philippines
Peer
AS17639
ComClark Network & Technology Corp
1.102
43
Poland
Upstream
AS50607
Stowarzyszenie e-Poludnie
498
5
Poland
Downstream
AS28978
COIG S.A
31
6
Poland
Downstream
AS12741
Netia SA
786
79
Poland
Downstream
AS31621
Allegro sp. z o.o.
28
8
Poland
Downstream
AS42656
Allegro sp. z o.o.
34
4
Portugal
Upstream
AS47787
EDGOO NETWORKS UNIPESSOAL LDA
2.968
21
Romania
Upstream
AS8708
RCS & RDS SA
756
106
Romania
Upstream
AS9050
ORANGE ROMANIA COMMUNICATION S.A
1.501
74
Russia
Upstream
AS3216
PJSC "Vimpelcom"
1.725
558
Russia
Upstream
AS48858
JSC "ER-Telecom Holding"
1.074
4
Russia
Upstream
AS20764
CJSC RASCOM
1.976
5
Russia
Upstream
AS31133
PJSC MegaFon
1.422
73
Russia
Upstream
AS8359
MTS PJSC
870
181
Russia
Peer
AS35598
INETCOM CARRIER LLC
2.309
7
Russia
Peer
AS42861
Foton Telecom CJSC
778
3
Serbia
Upstream
AS31042
Serbia BroadBand-Srpske Kablovske mreze d.o.o.
958
32
Serbia
Upstream
AS15958
CETIN Ltd. Belgrade
1.492
4
Singapore
Peer
AS24482
SG.GS
8.400
17
Singapore
Peer
AS18106
Viewqwest Pte Ltd
2.142
29
Slovakia
Downstream
AS6855
Slovak Telekom, a.s.
115
41
Slovakia
Downstream
AS28952
O2 Business Services, a.s
28
11
Slovakia
Downstream
AS43653
PEGO Slovakia, s.r.o.
18
2
Slovakia
Downstream
AS8778
Slovanet a.s.
54
5
Slovakia
Downstream
AS2607
Zdruzenie pouzivatelov Slovenskej akademickej datovej siete
33
13
Slovakia
Downstream
AS44185
bonet.systems, s. r. o.
15
3
Slovakia
Downstream
AS38949
Trestel SK, a.s.
21
2
Slovakia
Downstream
AS34820
DELTA ONLINE spol. s r.o.
38
12
Slovakia
Downstream
AS208882
Automation & Business, s.r.o.
17
4
Slovakia
Downstream
AS51013
WebSupport s.r.o.
22
20
South Africa
Upstream
AS5713
Telkom SA Ltd.
1.514
76
Sri Lanka
Peer
AS45489
Sri Lanka Telecom Ltd
1.799
3
Sweden
Upstream
AS12552
GlobalConnect AB
948
283
Sweden
Upstream
AS39351
31173 Services AB
2.616
47
Sweden
Peer
AS3399
Obenetwork AB
789
23
Switzerland
Upstream
AS34927
iFog GmbH
2.559
59
Switzerland
Upstream
AS9044
BSE Software GmbH
1.091
22
Switzerland
Upstream
AS13030
Init7 (Switzerland) Ltd.
840
68
Switzerland
Upstream
AS25091
IP-Max SA
2.951
18
Switzerland
Upstream
AS8758
Iway AG
1.275
46
Switzerland
Upstream
AS15576
NTS workspace AG
675
58
Switzerland
Peer
AS51873
Arcade Solutions AG
766
6
Switzerland
Peer
AS20932
Services Industriels de Geneve
1.432
5
Switzerland
Peer
AS15547
netplus.ch SA
1.370
38
Ukraine
Peer
AS48919
UACITY Ltd.
1.517
3
Ukraine
Downstream
AS204384
LLC "OTT UKRAINE"
41
32
United Arab Emirates
Upstream
AS15802
Emirates Integrated Telecommunications Company PJSC
1.539
35
United States
Upstream
AS2914
NTT America, Inc.
1.539
343
United States
Upstream
AS6939
Hurricane Electric LLC
10.675
262
United States
Upstream
AS6461
Zayo Bandwidth
2.651
223
United States
Peer
AS57406
Zero Distance LLC
1.392
6
United States
Peer
AS6233
xTom
1.749
58
United States
Peer
AS14907
Wikimedia Foundation Inc.
1.656
17
United States
Peer
AS14630
Invesco Group Services, Inc.
1.483
33
United States
Peer
AS36236
NetActuate, Inc
7.474
206
United States
Peer
AS1828
Unitas Global LLC
5.688
251
United States
Downstream
AS8518
RFE/RL, INC.
23
9
United States
Downstream
AS13335
Cloudflare, Inc.
1.338
2.749
United States
Downstream
AS21859
Zenlayer Inc
478
855
United States
Downstream
AS2686
AT&T Corp.
305
92
United States
Downstream
AS36692
Cisco OpenDNS, LLC
228
538
United States
Downstream
AS36351
SoftLayer Technologies Inc.
312
391
United States
Downstream
AS16509
Amazon.com, Inc.
379
12.350
United States
Downstream
AS55256
Netskope Inc
327
302
Uruguay
Upstream
AS6057
Administracion Nacional de Telecomunicaciones
3.949
19
Peer
AS23106
3.699
8
- - show more (+213 entries) - -
- - show less (-213 entries) - -
Internet eXchange (IX) connections
Country
City
IX name
Port speed
Members
Czech Republic
Praha 3
NIX.CZ
200 Gb
203
Netherlands
Amsterdam
AMS-IX
2 Gb
841
Announced (uniq) prefixes
Country
ASN
Announced prefix
Description
Size
Czech Republic
AS2852
78.128.128.0/17
CESNET-TCZ
32.768
Czech Republic
AS2852
146.102.0.0/16
CESNET z.s.p.o.
65.536
Czech Republic
AS2852
147.32.0.0/15
CESNET z.s.p.o.
131.072
Czech Republic
AS2852
147.228.0.0/16
CESNET z.s.p.o.
65.536
Czech Republic
AS2852
147.230.0.0/15
CESNET z.s.p.o.
131.072
Czech Republic
AS2852
147.251.0.0/16
CESNET z.s.p.o.
65.536
Czech Republic
AS2852
158.194.0.0/16
CESNET z.s.p.o.
65.536
Czech Republic
AS2852
158.196.0.0/16
CESNET z.s.p.o.
65.536
Czech Republic
AS2852
160.216.0.0/15
CESNET z.s.p.o.
131.072
Czech Republic
AS2852
185.8.160.0/22
CESNET-TCZ
1.024
Czech Republic
AS2852
193.84.32.0/20
Ceska zemedelska univerzita v Praze
4.096
Czech Republic
AS2852
193.84.53.0/24
Charles University
256
Czech Republic
AS2852
193.84.55.0/24
Charles University
256
Czech Republic
AS2852
193.84.56.0/21
Charles University
2.048
Czech Republic
AS2852
193.84.80.0/22
Prague 6
1.024
Czech Republic
AS2852
193.84.116.0/23
Institute of Chemical Process Fundamentals of the CAS, v.v.i.
512
Czech Republic
AS2852
193.84.160.0/20
UJV Rez, a.s.
4.096
Czech Republic
AS2852
193.84.192.0/19
Slezska univerzita v Opave
8.192
Czech Republic
AS2852
195.113.0.0/16
CESNET-TCZ
65.536
Czech Republic
AS2852
195.178.64.0/19
CESNET-T34CZ
8.192
Country
ASN
Announced prefix
Description
Size
Czech Republic
AS2852
2001:718::/29
CESNET z.s.p.o.
6,3E+29
- - show more (+10 entries) - -
- - show less (-10 entries) - -
Log
000
+000
Parse input (ASN)
000
+000
Search database for 'AS2852'
003
+002
1 ASN's found
003
+000
Done
003
+000
Load details of AS2852
137
+134
21 prefixes found
329
+192
224 peers found
334
+005
2 IX members found (3 connections)
358
+024
Statistics loaded
365
+007
12 links loaded, 7 verified
373
+008
23 historical items loaded
373
+000
Done