Autonomous system
AS24251 ICNTV-NET Iwakuni Cable Network Corporation
Unclassified APNIC
Summary
Iwakuni Cable Network Corporation
cable residential isp japan
The AS handle ICNTV-NET is held by Iwakuni Cable Network Corporation.
What it's used for
- The address space carries residential cable modem traffic, evidenced by reverse DNS entries such as
host-255.pool-c08.icn-tv.ne.jpandhost-255.dhcpn6.icn-tv.ne.jp. - The network announces 18432 IPv4 addresses across 12 prefixes and maintains 11 observed neighbours, a ratio consistent with a local access provider rather than a transit carrier.
Notable
- All registrants for the announced prefixes are listed as Japan Network Information Center with the netname
ICNTV-NET-CIDR-BLK-JPorICNTV-NET, aligning with the AS holder. - The inventory consists of 12 IPv4 prefixes with no IPv6 announcements, reflecting a legacy IPv4-only deployment typical of regional Japanese cable operators.
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 1 exchange in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| JPIX Tokyo | Tokyo, Japan | 210.171.224.239 |
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 12 prefixes · 18.43K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| JP | Japan | 12 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS24251- Registry name
- ICNTV-NET
- Registered
- 2004-10-19
- Last changed
- 2007-06-28
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 36 with no ROA
- ROAs
- 0 authorising AS24251
- ASPA
- no ASPA record
- IRR
- 100% registered · 36 of 36 announcements
- Route objects
- 101 naming AS24251
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 2026-10-29. 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