AS25192 — CZNIC-AS CZ.NIC, z.s.p.o.

AS25192 announces 5 IPv4 prefixes covering 5,632 addresses and 6 IPv6 prefixes.

About this network

The AS handle CZNIC-AS is held by CZ.NIC, z.s.p.o., the non-profit organization operating the .cz national top-level domain.

What it's used for

• The address space carries infrastructure for the .cz domain registry, with netnames explicitly referencing DNS operations such as E-NS-NIC-CZ and D-NS-NIC-CZ.
• The AS announces 5632 IPv4 addresses and 6 IPv6 prefixes while maintaining 153 observed neighbours, a ratio that indicates a transit or peering-heavy role rather than a large access network.

Notable

• Registrants for the majority of prefixes align with the announcer, listing "Top level domain .CZ Operations" and "CZ.NIC, z.s.p.o.", though one block is marked as RIPE-NCC managed.
• The address inventory is composed of five distinct IPv4 prefixes and six IPv6 prefixes, including a large /32 allocation in the 2001:1488::/32 range.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 185.43.132.0/23
• 185.43.134.0/24
• 193.29.206.0/24
• 194.0.12.0/23
• 217.31.192.0/20
• 2001:678:1::/48
• 2001:678:f::/48
• 2001:678:10::/48
• 2001:1488::/32
• 2001:148f:fffb::/48
• 2001:148f:fffd::/48

Upstream networks

• AS37474 ISPA SA
• AS1299 Arelion Sweden AB
• AS25248 RADIOKOMUNIKACE a.s.
• AS6939 Hurricane Electric LLC
• AS12570 O2 Czech Republic, a.s.
• AS38001 NewMedia Express Pte Ltd
• AS29802 HIVELOCITY, Inc.
• AS8674 Netnod AB
• AS34549 meerfarbig GmbH & Co. KG
• AS34867 Cosmonova LLC
• AS29504 Freenet Liberec, z.s.
• AS16876 ICANN
• AS34019 Hivane Association
• AS213241 TECHIT.BE SRL
• AS22548 Nucleo de Inf. e Coord. do Ponto BR - NIC.BR
• AS396356 Latitude.sh
• AS394256 Tech Futures Interactive Inc.
• AS20485 Joint Stock Company TransTeleCom
• AS8551 Bezeq International Ltd.
• AS48362 Stadtwerke Feldkirch
• AS29632 Netassist International EOOD
• AS24482 SG.GS
• AS40528 ICANN
• AS50304 Blix Solutions AS
• AS6461 Zayo Bandwidth

Downstream networks

• AS20701 CZ.NIC, z.s.p.o.
• AS26710 ICANN
• AS52234 NIC Chile
• AS29067 LLC "Hostmaster"
• AS52304 NIC Chile
• AS61455 LACTLD - LATIN AMERICAN AND CARIBBEAN TLD ASSOCIATION
• AS25152 Reseaux IP Europeens Network Coordination Centre (RIPE NCC)

Adjacent networks

• AS1299 Arelion Sweden AB
• AS25248 RADIOKOMUNIKACE a.s.
• AS20701 CZ.NIC, z.s.p.o.
• AS26710 ICANN
• AS6939 Hurricane Electric LLC
• AS37474 ISPA SA
• AS12570 O2 Czech Republic, a.s.
• AS38001 NewMedia Express Pte Ltd
• AS52234 NIC Chile
• AS29802 HIVELOCITY, Inc.
• AS29067 LLC "Hostmaster"
• AS8674 Netnod AB
• AS29504 Freenet Liberec, z.s.
• AS34549 meerfarbig GmbH & Co. KG
• AS24482 SG.GS
• AS34867 Cosmonova LLC
• AS52304 NIC Chile
• AS16876 ICANN
• AS34019 Hivane Association
• AS213241 TECHIT.BE SRL
• AS8218 Zayo Infrastructure France SA
• AS22548 Nucleo de Inf. e Coord. do Ponto BR - NIC.BR
• AS396356 Latitude.sh
• AS394256 Tech Futures Interactive Inc.
• AS20485 Joint Stock Company TransTeleCom

Routing security

• RPKI: 14 valid, 0 invalid and 0 not-found announcements; 16 ROAs.
• ASPA: 18 authorised providers.
• IRR: 100% of announcements registered; 32 route objects.
• Listed in as-sets: AS-28513, AS-29802-CUSTOMERS, AS-43413_NT-NIX, AS-AMCL-BB, AS-CECOMCZCUST-TRANSIT, AS-CESNET-NIX-PEERS, AS-CTBC-CUSTOMERS117, AS-CTBC-TOOLS-8, AS-CZNIC, AS-CZNIC-FENIX, AS-CZNIC-NIX, AS-CZNIC-TRANSIT, AS-DECIX-SERVICES, AS-DECIX-SERVICES-V6, AS-DIALTELECOM, AS-DURAND1-CUSTOMER, AS-HURRICANEV6, AS-ICANN-OTHERS, AS-ICANN-OTHERS6, AS-ITXBR1, AS-ITXCHILE, AS-KDDCUSTOMER2, AS-LINX, AS-MANDA-DECIX-PEERS-V4, AS-MANDA-DECIX-PEERS-V6.

Internet exchanges

• IX.br (PTT.br) São Paulo — São Paulo, Brazil
• DE-CIX Frankfurt — Frankfurt, Germany
• Milan Internet Exchange — Milan, Italy
• Giganet Internet Exchange — Kyiv, Ukraine
• Seattle Internet Exchange — Seattle, United States
• Singapore Internet Exchange — Singapore, Singapore
• Johannesburg Internet Exchange — Johannesburg, South Africa
• NIX.CZ - Neutral Internet eXchange for the Czech Republic — Prague, Czech Republic
• Netnod Stockholm — Stockholm, Sweden
• Equinix Los Angeles IBX — Los Angeles, United States
• Netnod Sundsvall- Gävle — Sundsvall, Sweden