Autonomous system
AS28725 CETIN-AS
Residential RIPE
Summary
CETIN (Czechia)
isp residential eyeball dsl fiber
CETIN a.s. (CETIN) — the Czech wholesale fixed and mobile access network, spun out of O2 Czech Republic in 2015.
What it's used for
- The physical DSL/fibre access network that carries home broadband for O2 and other Czech retail ISPs.
Notable
- An "eyeball" network: the addresses here are Czech home internet connections, even though CETIN sells wholesale to retail providers rather than direct to consumers.
- Carrier-of-carriers model — one of the largest access networks in the country by subscriber footprint.
Interesting
- CETIN (Czech Telecommunication Infrastructure) was carved out of O2 so the passive/access infrastructure could be operated and regulated separately from the retail brand; it is part of the PPF group.
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 7 exchanges in 5 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| DE-CIX Frankfurt | Frankfurt, Germany | 80.81.194.216 |
| LINX LON1 | London, United Kingdom | 195.66.225.12 |
| AMS-IX Amsterdam | Amsterdam, Netherlands | 80.249.214.27 |
| DE-CIX Dusseldorf | Düsseldorf, Germany | 185.1.171.9 |
| Peering.cz | Prague, Czech Republic | 185.0.20.191 |
| NIX.CZ - Neutral Internet eXchange for the Czech Republic | Prague, Czech Republic | 91.210.16.229 |
| Slovak Internet eXchange Bratislava | Bratislava, Slovakia | 192.108.148.67 |
Transit providers
33 upstream, 35 downstream and 111 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 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 7 prefixes · 134K addresses IPv6 2 prefixes
| Country | Name | Prefixes |
|---|---|---|
| CZ | Czechia | 9 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS28725- Registry name
- CETIN-AS
- Registrant
- CETIN-MNT
- Abuse contact
- abuse@cetin.cz
- Registered
- 2003-02-10
- Last changed
- 2020-03-24
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 91% valid · 10 valid, 1 with no ROA
- ROAs
- 9 authorising AS28725
- ASPA
- no ASPA record
- IRR
- 91% registered · 10 of 11 announcements
- Route objects
- 17 naming AS28725
Reputation
Classification and threat
Residential Fixed-line consumer ISP. Addresses here are homes.
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: 442 networks and 1,772 prefixes, as published 2026-10-15. 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