Autonomous system
AS6740 INEXT-CZ-ADA CEZNET s.r.o.
Residential RIPE
Summary
ČEZNET s.r.o.
isp legacy
INEXT-CZ-ADA is held by ČEZNET s.r.o., the retail internet arm of the Czech energy group ČEZ. ČEZNET sells fibre-to-the-home broadband over the group's backbone, which is operated by its parent Telco Pro Services.
What it's used for
- Consumer and small-business broadband in the Czech Republic. Reverse DNS on the announced space shows customer pools under two acquired regional ISP brands —
cust-….inext.czandcust-….numerinet.cz— thecust-prefix marking subscriber assignments. - Four RIPE allocations (
212.90.224.0/19,82.202.0.0/18,213.235.64.0/18,185.193.128.0/22), all with netnames of the formCZ-CEZNET21-….
Notable
- An electricity utility making a credible broadband ISP is less strange than it sounds: ČEZ already owned fibre strung along its transmission network for grid telemetry, and retail internet monetises the spare capacity.
- The AS name is a fossil.
INEXTwas a regional Czech provider absorbed into the group; the registry object still carries its name while the customers are billed by ČEZNET.
Interesting
- The dual rDNS domains are a straightforward map of the consolidation: each acquired ISP kept its own naming, and nobody renumbered the customers afterwards. Reverse DNS is often the last place a retired brand survives.
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
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS25424 | CEZNET s.r.o. | 236 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-01, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 4 prefixes · 41.98K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| CZ | Czechia | 4 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS6740- Registry name
- INEXT-CZ-ADA
- Registrant
- CEZNET-MNT
- Abuse contact
- dohled@ceznet.cz
- Registered
- 2002-07-03
- Last changed
- 2025-10-07
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 4 valid, 0 with no ROA
- ROAs
- 4 authorising AS6740
- ASPA
- no ASPA record
- IRR
- 100% registered · 4 of 4 announcements
- Route objects
- 4 naming AS6740
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: 449 networks and 1,846 prefixes, as published 2026-11-02. 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