Autonomous system
AS5610 O2-CZECH-REPUBLIC
Unclassified RIPE
Summary
O2 Czech Republic
isp legacy
O2-CZECH-REPUBLIC is the main autonomous system of O2 Czech Republic, a.s., the country's largest telecommunications operator, headquartered at Za Brumlovkou in Prague. It is the successor to the Czech incumbent and one of the largest networks registered in the RIPE region by address count.
What it's used for
Consumer and business internet access across the Czech Republic — fixed broadband, mobile data and corporate connectivity — plus transit for a long tail of downstream Czech networks. Around 1.5 million IPv4 addresses, overwhelmingly subscriber space.
Notable
Eyeball network. Addresses here are end users, so expect residential access patterns, NAT and dynamic assignment rather than servers. The RIPE object still lists Telia and Cogent as upstreams and a large peering fabric at NIX.CZ.
Interesting
The aut-num remarks read like an accidental customer list: dozens of named Czech downstreams and peers — banks, media groups, government registries, small regional ISPs — left in the object over the years. It is one of the more candid records in the RIPE database, and a reminder that whois objects often preserve operational history nobody meant to publish.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Address space
Summary
| Country | Name | Prefixes |
|---|---|---|
| CZ | Czechia | 105 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS5610- Registry name
- O2-CZECH-REPUBLIC
- Registrant
- AS5610-MTN
- Abuse contact
- abuse@o2.cz
- Registered
- 2002-07-22
- Last changed
- 2024-06-12
- Status
- active
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
No IC3 indicators Nothing from the FBI IC3 feed.
Threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere