AS23820 — RAKUTEN Rakuten Group, Inc.

Network type: hosting

AS23820 announces 2 IPv4 prefixes covering 69,632 addresses and 1 IPv6 prefixes.

About this network

RAKUTEN is the autonomous system for Rakuten Group, Inc., a Japanese technology conglomerate.

What it's used for

• The address space carries internal corporate infrastructure, evidenced by reverse DNS entries pointing to load balancers and development environments within the rdcnw.net domain (e.g., lb-133-237-157-255.lbaas.jpw2a.rdcnw.net).
• The AS announces 69,632 IPv4 addresses across 10 prefixes and 12 IPv6 prefixes, maintaining 14 observed neighbours; this ratio of substantial address inventory to a moderate peer count indicates a large internal corporate estate rather than a transit or access network.

Notable

• All registrants for the announced prefixes are listed as Japan Network Information Center (JPNIC) with netnames RAKUTEN-NET or Rakuten-CIDR-BLK-JP, aligning with the AS holder.
• The address inventory is heavily concentrated in the 133.237.0.0/17 block, which is subdivided into multiple smaller prefixes, reflecting a finely segmented internal network structure.

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

Announced prefixes

• 133.237.0.0/16
• 202.72.48.0/20
• 2403:400::/31

Upstream networks

• AS2914 NTT America, Inc.
• AS2497 Internet Initiative Japan Inc.
• AS2516 KDDI CORPORATION
• AS6939 Hurricane Electric LLC
• AS138384 Rakuten Mobile Network, Inc.
• AS24482 SG.GS
• AS17639 Converge ICT Solutions Inc.

Downstream networks

• AS131914 Rakuten Group, Inc.

Adjacent networks

• AS2914 NTT America, Inc.
• AS131914 Rakuten Group, Inc.
• AS2497 Internet Initiative Japan Inc.
• AS2516 KDDI CORPORATION
• AS6939 Hurricane Electric LLC
• AS138384 Rakuten Mobile Network, Inc.
• AS24482 SG.GS
• AS17639 Converge ICT Solutions Inc.

Internet exchanges

• BroadBand Internet eXchange Tokyo — Tokyo, Japan
• JPIX Tokyo — Tokyo, Japan
• Equinix Internet Exchange Osaka — Osaka, Japan