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AS57728

CEZNET s.r.o.

AS57728 is CEZNET s.r.o. (ceznet.cz). It announces 15,360 IPv4 addresses in 5 prefixes, and 3 IPv6 prefixes.

Czechia· RIPE· allocated 2019-10-21· business

15,360
IPv4 addresses announced
5
IPv4 prefixes
3
IPv6 prefixes
100.00%
of its routes RPKI-valid
15,360
of its IPv4 geolocated
1
country

Where its space is

The IPv4 it announces that IP Geolocation places, by country. A /24 counts for the AS announcing most of it.

  1. Czechia15,360 · 100.00%

Registry record

Its ASN Whois record, as the registry publishes it.

handle
CEZNET-AS
name
CEZNET s.r.o.
org
ORG-TBS13-RIPE
org name
CEZNET s.r.o.
org address
Duhova 1531/3, 140 00, Praha 4, CZECH REPUBLIC
org country
CZ
country
CZ
source
ripe
status
ASSIGNED
created
2019-10-21
updated
2025-09-26
remarks
---- NIX.CZ ---- / ---- PEERING.CZ ---- / ---- Telia ---- / ---- TPS ---- / ---- Superhosting.cz ---- / ---- Cerberos ---- / ---- 4NET ---- / ---- CSC ---- / ---- UPC ----
maintainer
RIPE-NCC-END-MNT|CEZNET-MNT
abuse name
CEZNET hostmaster
abuse email
dohled@ceznet.cz
abuse phone
+420 211 046 699
abuse kind
role

What the databases see

Addresses each address-keyed database holds in the IPv4 it announces, as a share of that space, with its largest providers. Counts overlap.

IPv4 prefixes

Every IPv4 prefix BGP Route saw it announce. A prefix another AS also announces says so.

5 prefixes
PREFIXCOUNTRYRPKIPEERSFIRST SEEN
81.25.16.0/21Czechiavalid172026-10-02
81.25.24.0/21Czechiavalid172026-10-02
109.234.40.0/21Czechiavalid172026-10-02
185.255.116.0/22Czechiavalid172026-10-02
188.122.192.0/19Czechiavalid172026-10-02

IPv6 prefixes

Every IPv6 prefix BGP Route saw it announce.

3 prefixes
PREFIXCOUNTRYRPKIPEERSFIRST SEEN
2a00:1800::/32Czechiavalid202026-10-02
2a00:1807::/32Czechiavalid202026-10-02
2a0a:b6c0::/32Czechiavalid202026-10-02
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