Autonomous system
AS25512 CDT-AS The Czech Republic
Unclassified RIPE NSP
Summary
CD-Telematika
telecom residential czech isp
The AS handle CDT-AS is held by CD-Telematika a.s., a Czech telecommunications provider.
What it's used for
- The address space carries residential and business internet services, evidenced by the reverse DNS record
pool.lidos.czand netnames consistently prefixed withCZ-CDT. - The AS announces 117,760 IPv4 addresses across 11 prefixes and maintains 51 observed neighbours, a ratio indicative of an access network providing connectivity to end-users rather than a transit provider.
Notable
- All registrants in the RDAP data align with the announcer, listing "CDT hostmaster; CD-Telematika a.s." for every prefix.
- The inventory consists of 11 distinct IPv4 blocks ranging from /17 to /22, alongside a single /32 IPv6 prefix, reflecting a consolidated corporate estate.
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 1 exchange in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| NIX.CZ - Neutral Internet eXchange for the Czech Republic | Prague, Czech Republic | 91.210.16.100 |
Transit providers
7 upstream, 24 downstream and 47 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 2026-10-27, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 11 prefixes · 118K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| CZ | Czechia | 12 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS25512- Registry name
- CDT-AS
- Registrant
- CDT-MNT
- Abuse contact
- abuse@cdt.cz
- Registered
- 2002-12-17
- Last changed
- 2025-07-29
- Allocation
- allocated
Declared
PeeringDB profile
- Name
- CD-Telematika a.s.
- Also known as
- CDT
- Network type
- NSP
- Scope
- Europe
- Traffic ratio
- Mostly Inbound
- Peering policy
- Open
- IRR as-set
AS-CDT-NETWORKS- Present at
- 2 exchanges
- Facilities
- 2 facilities
- Website
- http://www.cdt.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
- 14 authorising AS25512
- ASPA
- no ASPA record
- IRR
- 100% registered · 14 of 14 announcements
- Route objects
- 14 naming AS25512
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: 447 networks and 1,852 prefixes, as published 2026-10-27. 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