Autonomous system
AS23790 KCN-TV JCOM Co., Ltd.
Unclassified APNIC
Summary
JCOM
residential isp japan cable
KCN-TV is the AS handle for JCOM Co., Ltd., a major Japanese cable television and broadband internet service provider.
What it's used for
- The address space carries residential broadband traffic, evidenced by reverse DNS entries such as
gd202157047254.b3r.kcn-tv.ne.jpandgd119161117254.u6u.kcn-tv.ne.jp, which follow JCOM's standard naming convention for customer premises equipment. - The AS announces 18,432 IPv4 addresses across 2 prefixes and maintains only 1 observed neighbour, a ratio that indicates an access or eyeball network rather than a transit provider.
Notable
- The RDAP registrants for both announced prefixes are listed as Japan Network Information Center (JPNIC), which is the regional internet registry for Japan, rather than the operator directly.
- The address inventory consists of one large /18 block (202.157.0.0/18) and one smaller /21 block (119.161.112.0/21), both registered under the netname
JCN-CIDR-BLK-JP. - The AS has been observed in routing tables since 2004, indicating a long-standing presence in the Japanese internet infrastructure.
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, 0 downstream and 1 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS9824 | JCOM Co., Ltd. | 120 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-28, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 2 prefixes · 18.43K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| JP | Japan | 2 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS23790- Registry name
- KCN-TV
- Registered
- 2003-06-16
- Last changed
- 2022-02-18
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 2 valid, 0 with no ROA
- ROAs
- 2 authorising AS23790
- ASPA
- no ASPA record
- IRR
- 100% registered · 2 of 2 announcements
- Route objects
- 3 naming AS23790
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 1,851 prefixes, as published 2026-10-29. 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