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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.
1,297 autonomous systems registered to Japan. Click an AS for detail.
| 669 |
| AS17506JP | UCOM - ARTERIA Networks Corporation | 5.5M | 41 |
| AS2497JP | IIJ - Internet Initiative Japan Inc. | 4M | 206 |
| 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 |
| AS17953JP | ICO - BroadBand Security, Inc. | 12.3K | 196.6K | 14 |
| AS23630JP | CAC-NET - CAC Inc. | 12.3K | — | 5 |
| AS18266JP | ATNAP - Cable Networks Akita Co.,ltd. | 12.3K | 65.5K | 4 |
| AS4785JP | XTOM-AS-JP - xTom | 11.8K | 872.5K | 65 |
| AS17661JP | NHN-JAPAN - NHN Cloud Japan Corporation | 11.5K | — | 25 |
| AS24336JP | DIGITALBANK-JP - DIGITALBANK, Inc., Regional ISP in Japan | 11.3K | — | 13 |
| AS7529JP | NETIRD - GMO NetIRD, Inc. | 10.8K | 65.5K | 10 |
| AS18526JP | DDPS - DDPS Networks, LLC | 10.5K | 162 | 36 |
| AS24289JP | KBN - Kagawa T.V Broadcast Network Co,.Ltd | 10.2K | 1 | 5 |
| AS59126JP | NCT - NCT CO.,LTD. | 10.2K | 65.5K | 6 |
| AS131926JP | CTS-NET - Cable Television Saiki Co. , Ltd. | 10.2K | — | 4 |
| AS23618JP | ICV-NET - Ibara Broadcasting Company | 10.2K | 65.5K | 6 |
| AS131933JP | TTV-NET - TAMA Television Co., Ltd | 10.2K | 65.5K | 6 |
| 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 |
| AS138968JP | RAINBOWIDC-AS-AP - rainbow network limited | 9.5K | 589.8K | 22 |
| AS63798JP | IPA-ENTERNET - Industrial Cyber Security Center of Excellence | 9.2K | 768 | 4 |
| AS7664JP | HARENET - HARENET INC. | 9.2K | 65.5K | 3 |
| AS63770JP | ICSCOE-AS - Industrial Cyber Security Center of Excellence | 9.2K | 69.6K | 13 |
| AS45677JP | ICV - Isahaya Cable Media Co.,Ltd | 9.2K | 65.5K | 5 |
| AS18259JP | HIGE - NTT DOCOMO BUSINESS, Inc | 9K | 65.8K | 8 |
| AS151387JP | OCTP-NET - OMURA CABLE TELEVISION K.K. | 8.7K | — | 3 |
| AS173JP | NTTECL-AS - Nippon Telegraph and Telephone Corporation | 8.7K | — | 2 |
| AS131970JP | Hikarinet - Hikarinet Inc. | 8.7K | 65.5K | 3 |
| AS45687JP | MCT-Internet - Minamikyusyu CableTV Net Inc. | 8.7K | 65.5K | 7 |
| AS37908JP | KBC - KIBI Cable Television Co.,Ltd. | 8.7K | 65.5K | 7 |
| AS17940JP | CYBERLINKS - CYBER LINKS Co.,Ltd. | 8.7K | — | 4 |
| AS45691JP | DODO-CORE - DODO K.K. | 8.4K | 857.3K | 45 |
| AS55912JP | u-kochi - University of Kochi | 8.4K | 65.5K | 6 |
| AS23824JP | FUTURE - Future Spirits Co.,Ltd. | 8.2K | — | 3 |
| AS23795JP | FURUKAWA - Fitec Corp. | 8.2K | — | 6 |
| AS17977JP | SINGTEL-JP - NF Park Bldg.3F, 9-15, Futaba 2-Chome | 8.2K | — | 2 |
| AS59091JP | KAIT-NWLAB - Kanagawa Institute of Technology | 8.2K | — | 1 |
| AS23804JP | AIN-NET - Nonprofit Organization Kitaura Hana Net | 8.2K | — | 1 |
| AS45689JP | CONVIVIALNET - Convivial Net | 8.2K | 1 | 3 |
| AS17518JP | SHIOJIRI - Shiojiri City | 8.2K | — | 1 |
| AS23817JP | KOCHI-IDC - Fujitsu Limited. | 8.2K | — | 2 |
| AS7665JP | OKIX - Okayama Prefectural Government | 8.2K | 65.5K | 3 |
| AS45675JP | KMN-TOKYO - JCOM Co., Ltd. | 8.2K | — | 3 |
| AS17678JP | WIND - Gunma Internet Co,.ltd | 8.2K | 65.5K | 3 |
| AS7678JP | PROX - Prox System Design Inc. | 8.2K | — | 2 |
| AS17934JP | JGNv6 - National Institute of Information and Communications Technology | 8.2K | 114.7K | 14 |
| AS59096JP | MAIN - Meiji Gakuin University | 8.2K | — | 2 |
| AS7686JP | ATNETHOME - JCOM Co., Ltd. | 8.2K | — | 2 |
| AS9358JP | Finder - OPTAGE Inc. | 8.2K | — | 1 |