Autonomous system
AS9604 FSI-AS - FUJI SOFT INCORPORATED
Unclassified APNIC
Summary
Fuji Soft Incorporated
enterprise legacy
AS9604 (FSI-AS) is held by Fuji Soft Incorporated (富士ソフト株式会社), a large Yokohama-headquartered Japanese IT services group. Fuji Soft does systems development, integration, cloud and IT-security work for corporate clients, and operates through a set of subsidiaries covering engineering software, data-centre services and software development.
What it's used for
The routing shape says corporate network, not service provider. AS9604 announces just 3 IPv4 prefixes: a /19 (157.120.128.0/19), a /20 and a /21 out of 202.149.0.0, totalling 14,336 addresses, and no IPv6 at all. Crucially it has only one observed BGP neighbour. A network with a single upstream cannot be selling transit and is not peering at exchanges. Combined with a small, static address count that has clearly not grown, this is an enterprise announcing its own space for its own use: internal systems, the company's public-facing services, and the customer-facing infrastructure it runs as part of its integration and managed-service work.
Notable
- Single-homed with three prefixes is about as far from an ISP as a routed AS gets. Whatever Fuji Soft's data-centre subsidiaries sell, this particular AS is not carrying a broad multi-tenant hosting estate at scale.
- The address space is old:
202.149.0.0/20and202.149.16.0/21are early APNIC-era blocks, and the group announces them alongside the157.120.128.0/19, a legacy class-B-derived range. - Fuji Soft's own AS should not be confused with those of its subsidiaries or its clients. Card the network in front of you, which is the parent company's.
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
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.
| AS | Network | Paths seen |
|---|---|---|
| AS17676 | SoftBank Corp. | 177 |
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
IPv4 3 prefixes · 14.34K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| JP | Japan | 3 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS9604- Registry name
- FSI-AS
- Registered
- 1999-08-05
- Last changed
- 2015-02-11
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 3 with no ROA
- ROAs
- 0 authorising AS9604
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 3 announcements
- Route objects
- 0 naming AS9604
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: 453 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