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ASN Lookup Tool
AS2852 CESNET2

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ASN Extended Info API & BGP Active Prefixes API
ASN Details
ASN
AS2852
Organisation
CESNET z.s.p.o.
Name
CESNET2
Total IPv4 Addresses
849,920
Total IPv4 Prefixes
33
Total IPv6 Prefixes
4
Total IPv4 Bogon Prefixes
0
Total IPv6 Bogon Prefixes
0
IPv4 Space Rank
#414 out of 78,968
Registry
Ripe
Registered Country
CZ flagCZ
Registered Country Name
Czechia
Registered Date
2002-06-22
Registration Last Change
2025-07-25
Receiving From
ASN
Organisation
AS56662
PL flagMarcin Gondek
AS2914
US flagNTT America, Inc.
AS4230
BR flagCLARO S.A.
AS7713
ID flagTelekomunikasi Indonesia (PT)
AS6057
UY flagAdministracion Nacional de Telecomunicaciones
Showing 5 of 62
Transit To
ASN
Organisation
AS2607
SK flagZdruzenie pouzivatelov Slovenskej akademickej da..
AS1853
AT flagACONET
AS197451
CZ flagBrno University of Technology
AS197277
CZ flagState Institute for Drug Control
AS201648
CZ flagPlzensky kraj
Showing 5 of 18
IPv4 Active Prefixes
PrefixRange FromRange To
78.128.128.0/1778.128.128.078.128.255.255
146.102.0.0/16146.102.0.0146.102.255.255
147.32.0.0/16147.32.0.0147.32.255.255
147.33.0.0/16147.33.0.0147.33.255.255
147.228.0.0/16147.228.0.0147.228.255.255
Showing 5 of 33
IPv6 Active Prefixes
PrefixRange FromRange To
2001:718::/322001:718::2001:718:ffff:ffff:ffff:ffff:ffff:ffff
2001:719::/322001:719::2001:719:ffff:ffff:ffff:ffff:ffff:ffff
2001:71a::/312001:71a::2001:71b:ffff:ffff:ffff:ffff:ffff:ffff
2001:71c::/302001:71c::2001:71f:ffff:ffff:ffff:ffff:ffff:ffff