asn.dev

Autonomous system

AS18097 DCN - D.C.N. Corporation

Unclassified DROP-listed space RIPE

IPv4 addresses 10.50K 10 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly JP
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

DCN

Japan · AI-generated

isp residential japan access

DCN is operated by D.C.N. Corporation.

What it's used for

  • The address space carries residential and business access traffic, evidenced by reverse DNS entries such as pppoe254.149.east.tokyo.dcn.ne.jp and 0.180.189.210.k-isp.net.
  • With 19,712 IPv4 addresses announced across 15 prefixes and only 2 observed neighbours, the high address-to-neighbour ratio indicates an access or eyeball network rather than a transit provider.

Notable

  • Registrants vary significantly; while some blocks are registered to the Japan Network Information Center (JPNIC) under netnames like kronos-CIDR-BLK-JP and DCN-CIDR-BLK-JP, others belong to specific entities such as Rakushasu Inc, freeasy inc., ACE QUALITY Co.,Ltd, and EIC INC.
  • The inventory includes a mix of legacy JPNIC allocations and specific corporate registrations, suggesting a history of acquisitions or managed services for third-party organizations.
  • The address inventory is fragmented across multiple /21 and /22 blocks in Japan, with a single /32 IPv6 prefix announced.

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

2 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS7529GMO NetIRD, Inc.364
AS2914NTT America, Inc.32

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-04, 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 10 prefixes · 10.50K addresses IPv6 1 prefixes

CountryNamePrefixes
JPJapan11

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS18097
Registry name
DCN
Abuse contact
hostmaster@nic.ad.jp
Registered
2001-12-27
Last changed
2004-05-27
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 20 with no ROA
ROAs
0 authorising AS18097
ASPA
no ASPA record
IRR
35% registered · 7 of 20 announcements
Route objects
11 naming AS18097

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.

1 DROP match Announced space overlapping the DROP prefix list.

AnnouncedDROP entryRecord
216.179.198.0/23216.179.128.0/17SBL103083

Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 452 networks and 1,853 prefixes, as published 2026-11-05. 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