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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.
Share of announced address space covered by valid Route Origin Authorizations.
1,300 autonomous systems registered to Japan. Click an AS for detail.
| 668 |
| AS17506JP | UCOM - ARTERIA Networks Corporation | 5.5M | 41 |
| AS2497JP | IIJ - Internet Initiative Japan Inc. | 4M | 236 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
| 12.3K |
| — |
| 2 |
| AS23628JP | ACCSnet - Academic newtown Community Cable Service | 12.3K | 65.5K | 3 |
| AS55388JP | ASJ - ASJ INC. | 12.3K | 65.5K | 3 |
| 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 |
| AS24289JP | KBN - Kagawa T.V Broadcast Network Co,.Ltd | 10.2K | 1 | 5 |
| AS23618JP | ICV-NET - Ibara Broadcasting Company | 10.2K | 65.5K | 6 |
| 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 |
| AS151375JP | HIMAWARI-NET - HimawariTV.Corporation | 9.7K | — | 3 |
| AS17689JP | H-IX - Hokuden Information Technology,Inc. | 9.7K | 65.5K | 6 |
| AS138968JP | RAINBOWIDC-AS-AP - rainbow network limited | 9.5K | 589.8K | 22 |
| 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 |
| AS7664JP | HARENET - HARENET INC. | 9.2K | 65.5K | 3 |
| AS63798JP | IPA-ENTERNET - Industrial Cyber Security Center of Excellence | 9.2K | 768 | 4 |
| AS18259JP | HIGE - NTT DOCOMO BUSINESS, Inc | 9K | 65.8K | 8 |
| AS173JP | NTTECL-AS - Nippon Telegraph and Telephone Corporation | 8.7K | — | 2 |
| AS17940JP | CYBERLINKS - CYBER LINKS Co.,Ltd. | 8.7K | — | 4 |
| AS37908JP | KBC - KIBI Cable Television Co.,Ltd. | 8.7K | 65.5K | 7 |
| AS17934JP | JGNv6 - National Institute of Information and Communications Technology | 8.7K | 114.7K | 15 |
| AS45687JP | MCT-Internet - Minamikyusyu CableTV Net Inc. | 8.7K | 65.5K | 7 |
| AS131970JP | Hikarinet - Hikarinet Inc. | 8.7K | 65.5K | 3 |
| AS151387JP | OCTP-NET - OMURA CABLE TELEVISION K.K. | 8.7K | — | 3 |
| AS23804JP | AIN-NET - Nonprofit Organization Kitaura Hana Net | 8.2K | — | 1 |
| AS9358JP | Finder - OPTAGE Inc. | 8.2K | — | 1 |
| AS17977JP | SINGTEL-JP - NF Park Bldg.3F, 9-15, Futaba 2-Chome | 8.2K | — | 2 |
| AS17678JP | WIND - Gunma Internet Co,.ltd | 8.2K | 65.5K | 3 |
| AS45675JP | KMN-TOKYO - JCOM Co., Ltd. | 8.2K | — | 3 |
| AS23795JP | FURUKAWA - Fitec Corp. | 8.2K | — | 6 |
| AS59096JP | MAIN - Meiji Gakuin University | 8.2K | — | 2 |
| AS23824JP | FUTURE - Future Spirits Co.,Ltd. | 8.2K | — | 3 |
| AS17518JP | SHIOJIRI - Shiojiri City | 8.2K | — | 1 |
| AS7686JP | ATNETHOME - JCOM Co., Ltd. | 8.2K | — | 2 |
| AS7665JP | OKIX - Okayama Prefectural Government | 8.2K | 65.5K | 3 |
| AS59091JP | KAIT-NWLAB - Kanagawa Institute of Technology | 8.2K | — | 1 |
| AS7678JP | PROX - Prox System Design Inc. | 8.2K | — | 2 |
| AS23817JP | KOCHI-IDC - Fujitsu Limited. | 8.2K | — | 2 |
| AS45689JP | CONVIVIALNET - Convivial Net | 8.2K | 1 | 3 |
| AS45691JP | DODO-CORE - DODO K.K. | 8.2K | 856.1K | 42 |