asn.dev

Autonomous system

AS51449 KTUO-AS

Unclassified RIPE

IPv4 addresses 1.02K 3 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly CZ
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

Kabelová televize Ústí nad Orlicí

Czechia · AI-generated

cable residential voip local

The AS handle KTUO-AS is held by Kabelová televize Ústí nad Orlicí, spol. s r. o.

What it's used for

  • The address space carries local cable television, internet, and VoIP services, evidenced by reverse DNS entries such as 128-146.ktuo.cz and 64-136.ktuo.cz.
  • The network announces 1024 IPv4 addresses across 3 prefixes and 1 IPv6 prefix, with only 2 observed neighbours, indicating a small local access network rather than a transit provider.
  • Traffic from this AS consists of subscriber eyeballs and VoIP media/signalling for residents and businesses in the Ústí nad Orlicí region.

Notable

  • The RDAP registrants for all announced IPv4 prefixes list CEZNET s.r.o. as the hostmaster, while the AS holder is Kabelová televize Ústí nad Orlicí, suggesting the address space was originally allocated to or managed by CEZNET before being operated by the local cable provider.
  • The inventory is compact, consisting of three contiguous IPv4 blocks in the 82.144.136.0/22 range and a single /32 IPv6 prefix.

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

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

2 upstream, 0 downstream and 3 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS49101CEZNET s.r.o.269
AS25512CD-Telematika a.s.4

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-30, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 3 prefixes · 1.02K addresses IPv6 1 prefixes

CountryNamePrefixes
CZCzechia4

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS51449
Registry name
KTUO-AS
Registrant
MNT-KTCT
Abuse contact
abuse@ktuo.cz
Registered
2014-11-04
Last changed
2025-10-06
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 5 valid, 0 with no ROA
ROAs
5 authorising AS51449
ASPA
no ASPA record
IRR
100% registered · 5 of 5 announcements
Route objects
5 naming AS51449

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: 448 networks and 1,849 prefixes, as published 2026-10-30. 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

Cross-check