AS18139 — HISOL-CSV Hitachi Solutions, Ltd.

AS18139 announces 5 IPv4 prefixes covering 1,536 addresses and 1 IPv6 prefixes.

About this network

HISOL-CSV is the autonomous system for Hitachi Solutions, Ltd.

What it's used for

• The address space is registered under the netname HISOL-CSV-CIDR-BLK-JP for the 219.109.5.0/24 block, while the 133.108.x.x blocks carry the generic JPNIC-NET-JP-ERX netname.
• With 1536 IPv4 addresses announced across 5 prefixes and only 1 observed neighbour, the inventory suggests an internal corporate estate rather than a transit or access network.

Notable

• Registrants for the 133.108.0.0/16 space are listed as the Japan Network Information Center, consistent with JPNIC's role as the regional registry, while the 219.109.5.0/24 block is directly associated with the Hitachi Solutions netname.
• Hitachi Solutions is a subsidiary of the Hitachi Group, a Japanese multinational conglomerate.
• The inventory consists of a mix of /23 and /24 IPv4 prefixes alongside a single /32 IPv6 prefix.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 133.108.42.0/23
• 133.108.58.0/24
• 133.108.61.0/24
• 133.108.63.0/24
• 219.109.5.0/24
• 2406:8e00::/32

Upstream networks

• AS2516 KDDI CORPORATION

Adjacent networks

• AS2516 KDDI CORPORATION

Routing security

• RPKI: 0 valid, 0 invalid and 7 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 11 route objects.
• Listed in as-sets: AS-17697ARCSTAR, AS-BBX-PEERS, AS-GIGAINFRA, AS-HURRICANEV6, AS-IIJ, AS-IIJ6, AS-INFOSPHERE, AS-INFOSPHERE-V6, AS-KDD, AS-KDDI6, AS-PACNET-CUSTOMER-PROXY-REGISTER, AS-XO-B, AS2497:AS-IIJ, AS2497:AS-IIJ6.