Autonomous system
AS25192 CZNIC-AS
Unclassified RIPE NSP
Summary
CZ.NIC
registry tld infrastructure
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-CZandD-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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 11 exchanges in 9 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| IX.br (PTT.br) São Paulo | São Paulo, Brazil | 187.16.211.110 |
| DE-CIX Frankfurt | Frankfurt, Germany | 80.81.192.112 |
| Milan Internet Exchange | Milan, Italy | 217.29.67.72 |
| Giganet Internet Exchange | Kyiv, Ukraine | 185.1.63.124 |
| Seattle Internet Exchange | Seattle, United States | 206.81.80.138 |
| Singapore Internet Exchange | Singapore, Singapore | 103.16.102.189 |
| Johannesburg Internet Exchange | Johannesburg, South Africa | 196.60.97.18 |
| NIX.CZ - Neutral Internet eXchange for the Czech Republic | Prague, Czech Republic | 91.210.16.3 |
Transit providers
40 upstream, 7 downstream and 69 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 5 prefixes · 5.63K addresses IPv6 6 prefixes
| Country | Name | Prefixes |
|---|---|---|
| CZ | Czechia | 11 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS25192- Registry name
- CZNIC-AS
- Registrant
- CZ-NIC-MNT
- Abuse contact
- abuse@nic.cz
- Registered
- 2002-08-28
- Last changed
- 2017-11-15
- Allocation
- allocated
Declared
PeeringDB profile
- Name
- CZ.NIC, z.s.p.o.
- Network type
- NSP
- Scope
- Global
- Traffic ratio
- Balanced
- Peering policy
- Open
- IRR as-set
AS-CZNIC-TRANSIT- Present at
- 13 exchanges
- Website
- https://www.nic.cz/
PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.
Routing security
RPKI and IRR
- RPKI
- 100% valid · 14 valid, 0 with no ROA
- ROAs
- 16 authorising AS25192
- ASPA
- 17 declared providers
- IRR
- 100% registered · 14 of 14 announcements
- Route objects
- 32 naming AS25192
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 431 networks and 1,768 prefixes, as published 2026-10-12. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere