AS25512 — CDT-AS The Czech Republic

AS25512 announces 11 IPv4 prefixes covering 117,760 addresses and 1 IPv6 prefixes.

About this network

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.cz and netnames consistently prefixed with CZ-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.

Announced prefixes

• 81.19.32.0/20
• 82.117.128.0/19
• 82.202.64.0/18
• 85.13.64.0/18
• 85.184.16.0/20
• 89.203.128.0/17
• 131.117.192.0/21
• 185.134.0.0/22
• 195.146.96.0/19
• 212.11.96.0/19
• 213.235.128.0/18
• 2001:1a48::/32

Upstream networks

• AS174 Cogent Communications, LLC
• AS6939 Hurricane Electric LLC
• AS1299 Arelion Sweden AB
• AS6461 Zayo Bandwidth
• AS1764 Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH
• AS24482 SG.GS
• AS29504 Freenet Liberec, z.s.
• AS57463 NetIX Communications JSC
• AS8218 Zayo Infrastructure France SA

Downstream networks

• AS51331 SychrovNET s.r.o
• AS43614 Economia a.s.
• AS56450 Alberon Letohrad s.r.o
• AS206159 Fresh Data s.r.o.
• AS43507 RETE internet, s.r.o.
• AS200828 TERMS a.s.
• AS47868 AVONET, s.r.o.
• AS20609 KAZA.cz s.r.o.
• AS51524 Ales Tesacek
• AS197550 Internet4you.cz, spol. s r.o.
• AS56827 mirnet s.r.o.
• AS200355 CadcaNet plus s. r. o.
• AS3161 IT PROFI s.r.o.
• AS50975 KYOCERA AVX Components s.r.o.
• AS47131 PH, spol. s r. o.
• AS213387 TeSuNet s.r.o.
• AS56717 OG Soft s.r.o.
• AS20708 SKODA AUTO a.s.
• AS216450 Letiste Praha, a. s.
• AS6881 NIX.CZ z.s.p.o.
• AS60275 RVTech s.r.o.
• AS48417 ITS akciova spolecnost
• AS51449 Kabelova televize Usti nad Orlici, spol. s r. o.
• AS35046 OMEGA plus Chrudim s.r.o.

Adjacent networks

• AS1299 Arelion Sweden AB
• AS174 Cogent Communications, LLC
• AS6939 Hurricane Electric LLC
• AS51331 SychrovNET s.r.o
• AS43614 Economia a.s.
• AS20609 KAZA.cz s.r.o.
• AS56450 Alberon Letohrad s.r.o
• AS206159 Fresh Data s.r.o.
• AS43507 RETE internet, s.r.o.
• AS200828 TERMS a.s.
• AS47868 AVONET, s.r.o.
• AS56827 mirnet s.r.o.
• AS197550 Internet4you.cz, spol. s r.o.
• AS51524 Ales Tesacek
• AS3161 IT PROFI s.r.o.
• AS200355 CadcaNet plus s. r. o.
• AS50975 KYOCERA AVX Components s.r.o.
• AS47131 PH, spol. s r. o.
• AS29504 Freenet Liberec, z.s.
• AS213387 TeSuNet s.r.o.
• AS24482 SG.GS
• AS56717 OG Soft s.r.o.
• AS20708 SKODA AUTO a.s.
• AS57463 NetIX Communications JSC
• AS1764 Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH

Internet exchanges

• NIX.CZ - Neutral Internet eXchange for the Czech Republic — Prague, Czech Republic