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How Japan ranks worldwide on dormant space, the transfer market, routing security and address density.
PeeringDB-registered presence.
APNIC-measured end-user deployment.
Clean prefixes (valid RPKI + IRR, no mismatch).
Cumulative IPv4, IPv6, and ASN allocations to Japan over time.
The largest autonomous systems registered to Japan by IPv4 footprint.
| AS | Holder | IPv4 | Prefixes |
|---|---|---|---|
| AS17676JP | GIGAINFRA - SoftBank Corp. | 49.7M | 490 |
| AS4713JP | OCN - NTT DOCOMO BUSINESS,Inc. | 28.6M | 189 |
| AS2516JP | KDDI - KDDI CORPORATION | 18.2M | 578 |
| AS9824JP | JTCL-JP-AS - JCOM Co., Ltd. | 10.4M | 297 |
| AS2907JP | SINET-AS - Research Organization of Information and Systems, National Institute of Informatics | 9M | 668 |
| AS17506JP | UCOM - ARTERIA Networks Corporation | 5.5M | 41 |
| AS2497JP | IIJ - Internet Initiative Japan Inc. | 4.2M | 269 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
Share of announced address space covered by valid Route Origin Authorizations.
1,303 autonomous systems registered to Japan. Click an AS for detail.
| AS | Holder | IPv4 ↓ | IPv6 /48 | Prefixes |
|---|---|---|---|---|
| AS138968JP | RAINBOWIDC-AS-AP - rainbow network limited | 12.5K | 589.8K | 25 |
| AS23630JP | CAC-NET - CAC Inc. | 12.3K | — | 5 |
| AS4695JP | URBAN - Enecom,Inc. | 12.3K | — | 2 |
| AS23628JP | ACCSnet - Academic newtown Community Cable Service | 12.3K | 65.5K | 3 |
| AS55388JP | ASJ - ASJ INC. | 12.3K | 65.5K | 3 |
| AS17953JP | ICO - BroadBand Security, Inc. | 12.3K | 196.6K | 14 |
| AS18266JP | ATNAP - Cable Networks Akita Co.,ltd. | 12.3K | 65.5K | 4 |
| AS55385JP | DA - Digital Alliance Co.,Ltd. | 12.3K | 65.5K | 9 |
| AS18142JP | BIWALOBE - KISTEM Co., Ltd. | 12.3K | — | 2 |
| AS4785JP | XTOM-AS-JP - xTom | 11.8K | 938K | 66 |
| AS17661JP | NHN-JAPAN - NHN Cloud Japan Corporation | 11.5K | — | 25 |
| AS24336JP | DIGITALBANK-JP - DIGITALBANK, Inc., Regional ISP in Japan | 11.3K | — | 13 |
| AS18526JP | DDPS - DDPS Networks, LLC | 10.8K | 162 | 37 |
| AS7529JP | NETIRD - GMO NetIRD, Inc. | 10.8K | 65.5K | 10 |
| AS23618JP | ICV-NET - Ibara Broadcasting Company | 10.2K | 65.5K | 6 |
| AS24289JP | KBN - Kagawa T.V Broadcast Network Co,.Ltd | 10.2K | 1 | 5 |
| AS59126JP | NCT - NCT CO.,LTD. | 10.2K | 65.5K | 6 |
| AS131933JP | TTV-NET - TAMA Television Co., Ltd | 10.2K | 65.5K | 6 |
| AS131926JP | CTS-NET - Cable Television Saiki Co. , Ltd. | 10.2K | — | 4 |
| AS63784JP | GSS-NET - Digital Agency | 10K | 1M | 11 |
| AS17689JP | H-IX - Hokuden Information Technology,Inc. | 9.7K | 65.5K | 6 |
| AS151375JP | HIMAWARI-NET - HimawariTV.Corporation | 9.7K | — | 3 |
| AS7664JP | HARENET - HARENET INC. | 9.2K | 65.5K | 3 |
| AS45677JP | ICV - Isahaya Cable Media Co.,Ltd | 9.2K | 65.5K | 5 |
| AS63770JP | ICSCOE-AS - Industrial Cyber Security Center of Excellence | 9.2K | 69.6K | 13 |
| AS63798JP | IPA-ENTERNET - Industrial Cyber Security Center of Excellence | 9.2K | 768 | 4 |
| AS18259JP | HIGE - NTT DOCOMO BUSINESS, Inc | 9K | 65.8K | 8 |
| AS17940JP | CYBERLINKS - CYBER LINKS Co.,Ltd. | 8.7K | — | 4 |
| AS45687JP | MCT-Internet - Minamikyusyu CableTV Net Inc. | 8.7K | 65.5K | 7 |
| AS151387JP | OCTP-NET - OMURA CABLE TELEVISION K.K. | 8.7K | — | 3 |
| AS37908JP | KBC - KIBI Cable Television Co.,Ltd. | 8.7K | 65.5K | 7 |
| AS55912JP | u-kochi - University of Kochi | 8.7K | 65.5K | 7 |
| AS173JP | NTTECL-AS - Nippon Telegraph and Telephone Corporation | 8.7K | — | 2 |
| AS131970JP | Hikarinet - Hikarinet Inc. | 8.7K | 65.5K | 3 |
| AS5111JP | ALCL-AS-AP - Aibo Link Co., Ltd. | 8.4K | — | 2 |
| AS17934JP | JGNv6 - National Institute of Information and Communications Technology | 8.4K | 114.7K | 14 |
| AS45691JP | DODO-CORE - DODO K.K. | 8.4K | 856.1K | 44 |
| AS45680JP | DOVA-NET - DOVA Corporation | 8.4K | 65.5K | 9 |
| AS7678JP | PROX - Prox System Design Inc. | 8.2K | — | 2 |
| AS17977JP | SINGTEL-JP - NF Park Bldg.3F, 9-15, Futaba 2-Chome | 8.2K | — | 2 |
| AS45675JP | KMN-TOKYO - JCOM Co., Ltd. | 8.2K | — | 3 |
| AS23795JP | FURUKAWA - Fitec Corp. | 8.2K | — | 6 |
| AS152868JP | THX-NET - THX Corp. | 8.2K | — | 31 |
| AS23817JP | KOCHI-IDC - Fujitsu Limited. | 8.2K | — | 2 |
| AS9358JP | Finder - OPTAGE Inc. | 8.2K | — | 1 |
| AS7665JP | OKIX - Okayama Prefectural Government | 8.2K | 65.5K | 3 |
| AS59091JP | KAIT-NWLAB - Kanagawa Institute of Technology | 8.2K | — | 1 |
| AS17678JP | WIND - Gunma Internet Co,.ltd | 8.2K | 65.5K | 3 |
| AS23804JP | AIN-NET - Nonprofit Organization Kitaura Hana Net | 8.2K | — | 1 |
| AS7686JP | ATNETHOME - JCOM Co., Ltd. | 8.2K | — | 2 |