asn.dev

Autonomous system

AS18123 SEIRYO INAOKI EDUCATIONAL INSTITUTION

Unclassified ARIN

IPv4 addresses 1.54K 2 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

Seiryo - Inaoki Educational Institution

Japan · AI-generated

education business japan

SEIRYO INAOKI EDUCATIONAL INSTITUTION is the AS handle for Seiryo - Inaoki Educational Institution.

What it's used for

  • The address space is registered under JPNIC netnames KIWINET-CIDR-BLK-JP and JPNIC-NET-JP, indicating standard allocation from the Japan Network Information Center.
  • The AS announces 1536 IPv4 addresses across 2 prefixes and 1 IPv6 prefix, with only 2 observed neighbours, suggesting a small-scale internal or access network rather than a transit provider.

Notable

  • Registrants for both announced prefixes are listed as Japan Network Information Center and IRT-JPNIC-JP, which is standard for JPNIC-managed space and does not indicate a mismatch with the announcer.
  • The inventory consists of one /22 and one /23 block, representing a modest address footprint consistent with a single institutional site.

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 4 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS2907Research Organization of Information and Systems, National Institute of Informatics119
AS7668Hokuriku Telecommunication Network Co.40

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, 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 2 prefixes · 1.54K addresses IPv6 1 prefixes

CountryNamePrefixes
JPJapan3

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS18123
Registry name
SEIRYO
Abuse contact
hostmaster@nic.ad.jp
Registered
2002-03-21
Last changed
2018-02-15
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 3 with no ROA
ROAs
0 authorising AS18123
ASPA
no ASPA record
IRR
67% registered · 2 of 3 announcements
Route objects
2 naming AS18123

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: 432 networks and 1,768 prefixes, as published 2026-10-12. 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