asn.dev

Autonomous system

AS23808 TOSHIMA-NET TOSHIMA CABLE NETWORK CO.,LTD

Unclassified ARIN

IPv4 addresses 14.34K 4 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly JP
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

Toshima Cable Network

Japan · AI-generated

cable isp residential japan

The AS handle TOSHIMA-NET is operated by Toshima Cable Network Co., Ltd.

What it's used for

  • The address space carries residential cable access traffic, evidenced by reverse DNS entries such as gs215-254.toshima.ne.jp and gs107-254.toshima.ne.jp.
  • The network announces 14336 IPv4 addresses across 4 prefixes and maintains a single observed neighbour, a ratio characteristic of an access or eyeball network rather than a transit provider.

Notable

  • All four announced prefixes share the netname Toshima-Network-CIDR-BLK-JP with registrants listed as Japan Network Information Center and IRT-JPNIC-JP, aligning with the AS holder.
  • The address inventory consists of four distinct IPv4 blocks, including a /19 and a /20, with no IPv6 prefixes currently in inventory.

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

1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS9824JCOM Co., Ltd.234

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-27, 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 4 prefixes · 14.34K addresses IPv6 0 prefixes

CountryNamePrefixes
JPJapan4

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS23808
Registry name
TOSHIMA-NET
Abuse contact
hostmaster@nic.ad.jp
Registered
2003-06-16
Last changed
2026-04-28
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 4 valid, 0 with no ROA
ROAs
4 authorising AS23808
ASPA
no ASPA record
IRR
100% registered · 4 of 4 announcements
Route objects
16 naming AS23808

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 1,852 prefixes, as published 2026-10-27. 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