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ASN Lookup Tool
AS57728 CEZNET-AS

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ASN Extended Info API & BGP Active Prefixes API
ASN Details
ASN
AS57728
Organisation
CEZNET s.r.o.
Name
CEZNET-AS
Total IPv4 Addresses
15,360
Total IPv4 Prefixes
5
Total IPv6 Prefixes
3
Total IPv4 Bogon Prefixes
0
Total IPv6 Bogon Prefixes
0
IPv4 Space Rank
#7,593 out of 79,211
Registry
Ripe
Registered Country
CZ flagCZ
Registered Country Name
Czechia
Registered Date
2019-10-21
Registration Last Change
2025-09-26
Receiving From
ASN
Organisation
AS39791
CZ flagTelco Pro Services, a. s.
IPv4 Active Prefixes
PrefixRange FromRange To
81.25.16.0/2181.25.16.081.25.23.255
81.25.24.0/2181.25.24.081.25.31.255
109.234.40.0/21109.234.40.0109.234.47.255
185.255.116.0/22185.255.116.0185.255.119.255
188.122.192.0/19188.122.192.0188.122.223.255
IPv6 Active Prefixes
PrefixRange FromRange To
2a00:1800::/322a00:1800::2a00:1800:ffff:ffff:ffff:ffff:ffff:ffff
2a00:1807::/322a00:1807::2a00:1807:ffff:ffff:ffff:ffff:ffff:ffff
2a0a:b6c0::/322a0a:b6c0::2a0a:b6c0:ffff:ffff:ffff:ffff:ffff:ffff