asn.dev

Autonomous system

AS37900 MATSURI NTT Communications Corporation

Unclassified RIPE

IPv4 addresses 1.02K 3 prefixes
IPv6 prefixes 3 counted as prefixes, not addresses
Countries 1 mostly JP
Exchanges 0 recorded by PCH
Upstreams 4 0 downstream
Flagged prefixes 0 none

Summary

NTT DOCOMO BUSINESS

Japan · AI-generated

business enterprise japan

MATSURI is the AS handle for NTT DOCOMO BUSINESS, Inc.

What it's used for

  • The address space carries enterprise traffic, evidenced by the netname NTTDOCOMO-JP and registrant NTT DOCOMO Business, Inc across all announced prefixes.
  • The AS announces 1024 IPv4 addresses and 3 IPv6 prefixes, with 4 observed neighbours; this low neighbour count relative to the address inventory indicates an internal corporate estate rather than a transit or access network.
  • Traffic from this AS consists of office workers and internal business endpoints for NTT DOCOMO's corporate operations.

Notable

  • Registrants agree with the announcer, with all prefixes registered to NTT DOCOMO Business, Inc under the netname NTTDOCOMO-JP.
  • The address inventory is finely subdivided into three IPv4 prefixes and three IPv6 /48s, consistent with site-by-site segmentation for a large corporate entity.

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

4 upstream, 0 downstream and 7 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS2516KDDI CORPORATION96
AS2914NTT America, Inc.92
AS4713NTT DOCOMO BUSINESS,Inc.92
AS17676SoftBank Corp.59

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

Shape and geography

IPv4 3 prefixes · 1.02K addresses IPv6 3 prefixes

CountryNamePrefixes
JPJapan6

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS37900
Registry name
MATSURI
Registered
2006-01-30
Last changed
2026-02-02
Allocation
allocated

Declared

PeeringDB profile

self-reported
Name
NTT DOCOMO BUSINESS, Inc. AS37900
Scope
Not Disclosed
Traffic ratio
Not Disclosed
Website
https://www.ntt.com/

PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 7 valid, 0 with no ROA
ROAs
3 authorising AS37900
ASPA
no ASPA record
IRR
29% registered · 2 of 7 announcements
Route objects
8 naming AS37900

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

Cross-check