Autonomous system
AS49101 KTCT-ASN
Unclassified RIPE
Summary
CEZNET s.r.o.
isp residential czech cable
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.czand255-131.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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
1 upstream, 3 downstream and 8 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS39791 | Telco Pro Services, a. s. | 186 |
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
IPv4 14 prefixes · 13.31K addresses IPv6 17 prefixes
| Country | Name | Prefixes |
|---|---|---|
| CZ | Czechia | 31 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS49101- Registry name
- KTCT-ASN
- Registrant
- CEZNET-MNT
- Abuse contact
- dohled@ceznet.cz
- Registered
- 2009-04-14
- Last changed
- 2025-11-26
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 4 valid, 0 with no ROA
- ROAs
- 6 authorising AS49101
- ASPA
- no ASPA record
- IRR
- 100% registered · 4 of 4 announcements
- Route objects
- 70 naming AS49101
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 1,848 prefixes, as published 2026-10-31. 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