AS49101 — KTCT-ASN CEZNET s.r.o.

AS49101 announces 14 IPv4 prefixes covering 13,312 addresses and 10 IPv6 prefixes.

About this network

The AS handle KTCT-ASN is held by CEZNET s.r.o.

What it's used for

• The address space carries residential and business internet access, evidenced by reverse DNS entries such as 0-52.gtt-net.cz and 255-131.gtt-net.cz.
• The network announces 13,312 IPv4 addresses across 14 prefixes and 17 IPv6 prefixes, maintaining only 4 observed neighbours, a ratio characteristic of an access network rather than a transit provider.
• Traffic from this AS consists of subscriber eyeballs and local business endpoints served by CEZNET's cable and fixed-line infrastructure in the Czech Republic.

Notable

• Registrants for the 82.144.0.0/16 space are listed as CEZNET s.r.o., while the 46.36.0.0/16 space is registered to GTT a.s., indicating a mix of owned and leased or historically allocated address blocks.
• The inventory is split between two distinct /16 ranges, with the 82.144.0.0/16 block subdivided into multiple /21 and /23 prefixes.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 46.36.32.0/23
• 46.36.34.0/24
• 46.36.42.0/23
• 46.36.45.0/24
• 46.36.46.0/23
• 46.36.48.0/20
• 82.144.128.0/21
• 82.144.137.0/24
• 82.144.138.0/23
• 82.144.140.0/23
• 82.144.142.0/24
• 82.144.144.0/23
• 82.144.148.0/22
• 82.144.152.0/21
• 2a02:d00::/32
• 2a02:25b0::/32
• 2a02:25b0:aaab::/48
• 2a02:25b0:aaac::/46
• 2a02:25b0:aab0::/44
• 2a02:25b0:aac0::/42
• 2a02:25b0:ab00::/40
• 2a02:25b0:ac00::/38
• 2a02:25b0:b000::/36
• 2a02:25b0:c000::/34

Upstream networks

• AS39791 Telco Pro Services, a. s.

Downstream networks

• AS42422 SecurityNet.cz s.r.o.
• AS51449 Kabelova televize Usti nad Orlici, spol. s r. o.
• AS49244 Scancom s.r.o.

Adjacent networks

• AS39791 Telco Pro Services, a. s.
• AS42422 SecurityNet.cz s.r.o.
• AS51449 Kabelova televize Usti nad Orlici, spol. s r. o.
• AS49244 Scancom s.r.o.

Routing security

• RPKI: 4 valid, 0 invalid and 0 not-found announcements; 6 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 70 route objects.
• Listed in as-sets: AS-CDT-NETWORKS, AS-KTCZ-NET, AS-SET-SCANCOM.