Autonomous system
AS42343 KTAB-AS
Residential RIPE Cable/DSL/ISP
Summary
Karjaan Puhelin Oy
isp residential regional cable
KTAB-AS is operated by Karjaan Puhelin Oy, a regional telecommunications provider in Finland.
What it's used for
- The address space carries residential customer traffic, evidenced by reverse DNS entries such as
customer.karistelefon.fiandcust.ktab.fi. - The network announces 20,480 IPv4 addresses across 4 prefixes and 1 IPv6 prefix, while maintaining 19 observed neighbours; this ratio indicates an access network rather than a transit provider.
- Traffic consists of subscriber eyeballs for cable and DSL services in the Karis region, consistent with the operator's classification as a regional Cable/DSL/ISP.
Notable
- All registrants for the announced prefixes are listed as Karjaan Puhelin Oy, matching the AS holder.
- The address inventory is composed of four distinct IPv4 blocks, including a large /18 and three smaller /22 and /21 blocks, all registered under netnames beginning with
FI-KTAB.
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
Recorded at 2 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| Netnod Stockholm | Stockholm, Sweden | 195.69.119.192 |
| Netnod Sundsvall- Gävle | Sundsvall, Sweden | 194.68.128.192 |
Transit providers
8 upstream, 0 downstream and 12 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-31, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 4 prefixes · 20.48K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| FI | Finland | 5 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS42343- Registry name
- KTAB-AS
- Registrant
- MNT-KTAB
- Abuse contact
- abuse@ktab.fi
- Registered
- 2007-02-06
- Last changed
- 2026-07-06
- Allocation
- allocated
Declared
PeeringDB profile
- Name
- Karjaan Puhelin Oy
- Also known as
- Karis Telefon Ab
- Network type
- Cable/DSL/ISP
- Scope
- Regional
- Traffic ratio
- Mostly Inbound
- Peering policy
- Open
- IRR as-set
AS42343:AS-KTAB- Present at
- 8 exchanges
- Website
- http://www.karistelefon.fi
PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.
Routing security
RPKI and IRR
- RPKI
- 100% valid · 5 valid, 0 with no ROA
- ROAs
- 5 authorising AS42343
- ASPA
- no ASPA record
- IRR
- 100% registered · 5 of 5 announcements
- Route objects
- 5 naming AS42343
Reputation
Classification and threat
Residential Fixed-line consumer ISP. Addresses here are homes.
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 1,843 prefixes, as published 2026-11-01. 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