AS28725 — CETIN-AS CETIN a.s.

Network type: residential

AS28725 announces 7 IPv4 prefixes covering 134,400 addresses and 2 IPv6 prefixes.

About this network

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.

Announced prefixes

• 80.78.150.0/24
• 85.162.0.0/15
• 136.238.226.0/24
• 185.218.92.0/23
• 194.50.64.0/22
• 194.147.12.0/22
• 212.96.180.0/24
• 2a07:1f40::/29
• 2a0b:bb40::/32

Upstream networks

• AS1299 Arelion Sweden AB
• AS6939 Hurricane Electric LLC
• AS174 Cogent Communications, LLC
• AS34549 meerfarbig GmbH & Co. KG
• AS50304 Blix Solutions AS
• AS213241 TECHIT.BE SRL
• AS24482 SG.GS
• AS37721 Virtual Technologies & Solutions
• AS50300 CustodianDC Limited
• AS17639 Converge ICT Solutions Inc.
• AS29504 Freenet Liberec, z.s.
• AS48185 team.blue NV
• AS1836 green.ch AG
• AS48362 Stadtwerke Feldkirch
• AS212024 Marc Schmitt
• AS34019 Hivane Association
• AS3333 Reseaux IP Europeens Network Coordination Centre (RIPE NCC)
• AS20485 Joint Stock Company TransTeleCom
• AS4657 StarHub Ltd
• AS12779 IT.Gate S.p.A.
• AS50673 Serverius Holding B.V.
• AS3741 Dimension Data
• AS12552 GlobalConnect AB
• AS8551 Bezeq International Ltd.
• AS293 ESnet

Downstream networks

• AS203645 Jan Ryznar
• AS52029 Palanet s.r.o.
• AS24641 FASTER CZ spol. s r.o.
• AS56566 SATT a.s.
• AS206438 MX-NET Telekomunikace s.r.o.
• AS35613 FASTER CZ spol. s r.o.
• AS50784 Intraweb servis s.r.o.
• AS206177 SitePark s.r.o.
• AS196952 BEZVANET s.r.o.
• AS35046 OMEGA plus Chrudim s.r.o.
• AS57294 Internet Expert s.r.o.
• AS57560 XLNET s.r.o.
• AS198248 Richard Filip
• AS48364 Pe3ny Net s.r.o.
• AS212975 TeamCity s.r.o.
• AS209947 M-wifi internet s.r.o.
• AS212859 KXCOMM s.r.o.
• AS51382 Ing. Leos Janouch
• AS57288 StaMPi, spol. s r.o.
• AS213559 MyOffice, s.r.o.
• AS198346 NETFORMS s.r.o.
• AS203365 Optet network, s. r. o.
• AS51420 cyrilek.net z.s.
• AS205619 Jiri Chalabala
• AS197565 NHK Solutions s.r.o.

Adjacent networks

• AS1299 Arelion Sweden AB
• AS24641 FASTER CZ spol. s r.o.
• AS203645 Jan Ryznar
• AS6939 Hurricane Electric LLC
• AS174 Cogent Communications, LLC
• AS35613 FASTER CZ spol. s r.o.
• AS52029 Palanet s.r.o.
• AS34549 meerfarbig GmbH & Co. KG
• AS35046 OMEGA plus Chrudim s.r.o.
• AS56566 SATT a.s.
• AS206438 MX-NET Telekomunikace s.r.o.
• AS50784 Intraweb servis s.r.o.
• AS206177 SitePark s.r.o.
• AS213241 TECHIT.BE SRL
• AS196952 BEZVANET s.r.o.
• AS37721 Virtual Technologies & Solutions
• AS50304 Blix Solutions AS
• AS34019 Hivane Association
• AS17639 Converge ICT Solutions Inc.
• AS48362 Stadtwerke Feldkirch
• AS48185 team.blue NV
• AS57294 Internet Expert s.r.o.
• AS57560 XLNET s.r.o.
• AS198248 Richard Filip
• AS48364 Pe3ny Net s.r.o.

Routing security

• RPKI: 11 valid, 0 invalid and 1 not-found announcements; 10 ROAs.
• ASPA: none published.
• IRR: 92% of announcements registered; 18 route objects.
• Listed in as-sets: AS-BTN-CUSTOMERS, AS-CESNET-NIX-PEERS, AS-CETIN, AS-CTIOL, AS-CTNET, AS-MANDA-DECIX-PEERS-V4, AS-MANDA-DECIX-PEERS-V6, AS-MANDA-LINX-PEERS-V4, AS-MANDA-LINX-PEERS-V6, AS203462:AS-NVC-DECIX_FRA_RS, AS24971:AS-MAI-NIX-PEER, AS42000:AS-NIXCZ-PEERINGS, AS6695:AS-DECIX-FRA-CONNECTED, AS6695:AS-DECIX-FRA-RS, AS6695:AS-DECIX-FRA-RS-V6, AS6777:AS-AMS-IX-RS, AS6777:AS-AMS-IX-RS-V6, AS680:AS-AMSIX-RS-PEERS.

Internet exchanges

• DE-CIX Frankfurt — Frankfurt, Germany
• LINX LON1 — London, United Kingdom
• AMS-IX Amsterdam — Amsterdam, Netherlands
• DE-CIX Dusseldorf — Düsseldorf, Germany
• Peering.cz — Prague, Czech Republic
• NIX.CZ - Neutral Internet eXchange for the Czech Republic — Prague, Czech Republic
• Slovak Internet eXchange Bratislava — Bratislava, Slovakia