AS9604 — FSI-AS - FUJI SOFT INCORPORATED

AS9604 announces 3 IPv4 prefixes covering 14,336 addresses and 0 IPv6 prefixes.

About this network

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: 202.149.0.0/20 and 202.149.16.0/21 are early APNIC-era blocks, and the group announces them alongside the 157.120.128.0/19, 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.

Announced prefixes

• 157.120.128.0/19
• 202.149.0.0/20
• 202.149.16.0/21

Upstream networks

• AS17676 SoftBank Corp.

Adjacent networks

• AS17676 SoftBank Corp.

Routing security

• RPKI: 0 valid, 0 invalid and 3 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 0% of announcements registered; 0 route objects.
• Listed in as-sets: AS-BBIX-T, AS-KDD.