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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
25
Total IPv6 Prefixes
4
Total IPv4 Bogon Prefixes
0
Total IPv6 Bogon Prefixes
0
IPv4 Space Rank
#403 out of 79,220
Registry
Ripe
Registered Country
CZ flagCZ
Registered Country Name
Czechia
Registered Date
2002-06-22
Registration Last Change
2025-12-14
Receiving From
ASN
Organisation
AS4230
BR flagCLARO S.A.
AS7713
ID flagTelekomunikasi Indonesia (PT)
AS6057
UY flagAdministracion Nacional de Telecomunicaciones
AS8708
RO flagDIGI ROMANIA S.A.
AS5713
ZA flagTelkom SA Ltd.
Showing 5 of 58
Transit To
ASN
Organisation
AS2607
SK flagZdruzenie pouzivatelov Slovenskej akademickej da..
AS1853
AT flagACONET
AS197451
CZ flagBrno University of Technology
AS198500
CZ flagMasarykova univerzita - Ustav vypocetni techniky..
AS197277
CZ flagState Institute for Drug Control
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 25
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