Autonomous System
AS25512 CD-Telematika a.s.
ISPActiveCzechiaRIPE
AS25512 (CDT-AS) is an ISP network operated by CD-Telematika a.s. in Czechia, registered with RIPE. It has 11 IPv4 prefixes with 117,760 addresses and 1 IPv6 prefix, which makes it the 2,112th largest of 82,200 active autonomous systems by IPv4 space.
IPv4 addresses117,760in 11 prefixes
IPv6 prefixes1≈ 7.9 × 10²⁸ addresses
Size rank#2,112of 82,200 active ASNs
Details
OrganizationCD-Telematika a.s.
AS nameCDT-AS
Websitecdt.cz
Country Czechia (CZ)
Network typeISP
RegistryRIPE
Abuse contactabuse@cdt.cz
Registered2002-12-17
Last updated2025-07-29
IPv4 prefixes
11 prefixes · 117,760 addresses| Network | Addresses | First – last address |
|---|---|---|
| 89.203.128.0/17 | 32,768 | 89.203.128.0 – 89.203.255.255 |
| 82.202.64.0/18 | 16,384 | 82.202.64.0 – 82.202.127.255 |
| 85.13.64.0/18 | 16,384 | 85.13.64.0 – 85.13.127.255 |
| 213.235.128.0/18 | 16,384 | 213.235.128.0 – 213.235.191.255 |
| 82.117.128.0/19 | 8,192 | 82.117.128.0 – 82.117.159.255 |
| 195.146.96.0/19 | 8,192 | 195.146.96.0 – 195.146.127.255 |
| 212.11.96.0/19 | 8,192 | 212.11.96.0 – 212.11.127.255 |
| 81.19.32.0/20 | 4,096 | 81.19.32.0 – 81.19.47.255 |
| 85.184.16.0/20 | 4,096 | 85.184.16.0 – 85.184.31.255 |
| 131.117.192.0/21 | 2,048 | 131.117.192.0 – 131.117.199.255 |
| 185.134.0.0/22 | 1,024 | 185.134.0.0 – 185.134.3.255 |
89.203.128.0/17 82.202.64.0/18 85.13.64.0/18 213.235.128.0/18 82.117.128.0/19 195.146.96.0/19 212.11.96.0/19 81.19.32.0/20 85.184.16.0/20 131.117.192.0/21 185.134.0.0/22
IPv6 prefixes
1 prefix- 2001:1a48::/32
2001:1a48::/32
Query AS25512 with the API
The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day.
curl "https://api.ipapi.is/?q=AS25512&key=YOUR_API_KEY"Any address in its prefixes resolves to AS25512, with or without a key:
curl "https://api.ipapi.is/?q=89.203.128.1"Largest networks in Czechia
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