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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 |
| 1 |
| 2 |
| AS214675JP | Starlamp Hidenori Matsuo | 256 | 4.7K | 17 |
| AS55373JP | TRI-KOBE-NET - Foundation for Biomedical Research and Innovation at Kobe | 256 | — | 1 |
| AS9434JP | ABONE-AS-AP - Internet Initiative Japan, Inc. | 256 | — | 1 |
| AS58790JP | TeamFelNull - SERVER-G Group | 256 | 11 | 6 |
| AS131951JP | SSC - Suzuyo Shinwart Corporation | 256 | 256 | 2 |
| AS38649JP | UEC-EXP - The University of Electro-Communications | 256 | — | 1 |
| AS131964JP | CYBERHOME3 - FAMILYNET JAPAN CORPORATION | 256 | 1 | 2 |
| AS131903JP | NRI-IVPN - Nomura Research Institute,Ltd. | 256 | — | 1 |
| AS45678JP | AAC-JP-AS - ABN AMRO Clearing Tokyo Co., Ltd. | 256 | — | 1 |
| AS152724JP | POINT72-AS-AP - Point72 Japan Limited | 256 | — | 1 |
| AS133180JP | STARBOWLTD-AS-AP - Starbow Ltd. | 256 | — | 1 |
| AS9609JP | BBIX-CDN - BBIX, Inc. | 256 | 1 | 2 |
| AS137008JP | OPENTEXT-AS-AP-JP-TOK - 1120 Shimokuzawa Chuo-ku Sagamihara-shi Kanagawa-ken | 256 | — | 1 |
| AS132119JP | TECPRESSO-NET-AP - TECPRESSO Inc. | 256 | 1 | 2 |
| AS23774JP | A-DNS-JP - Japan Registry Service Co., Ltd. | 256 | 65.5K | 2 |
| AS131924JP | KAP-NET - Kansai Airports | 256 | 1 | 2 |
| AS152867JP | TCNET - Takaoka cable network | 256 | 4.1K | 2 |
| AS152870JP | KAICHI-NET - Incorporated Educational Institution Kaichigakuen | 256 | 1 | 2 |
| AS146986JP | SSC-3 - SUZUYO SHINWART CORPORATION | 256 | 256 | 2 |
| AS59115JP | CYBERDYNE - CYBERDYNE Inc. | 256 | 1 | 2 |
| AS135372JP | CSJI-AS-AP - Columbia Sportswear Japan Inc | 256 | — | 1 |
| AS37905JP | BRASTEL-NET - Brastel Co.,Ltd | 256 | — | 1 |
| AS152184JP | TAMUKAINET-AS-AP - Tamukai Network | 256 | 264 | 10 |
| AS133780JP | QMC-AS-AP - Quantum Mesh Co.,Ltd. | 256 | 1 | 2 |
| AS38647JP | GeekN-NetLab - NEI's NetLab | 256 | — | 1 |
| AS134827JP | EYJAPAN-AS-AP - EY Japan Co., Ltd. | 256 | — | 1 |
| AS38644JP | KANDANET - INTERNET MULTIFEED CO. | 256 | 1 | 2 |
| AS131948JP | FORNEXT - FORNEXT Inc. | 256 | 1 | 2 |
| AS151379JP | NCJ - OPTAGE Inc. | 256 | — | 1 |
| AS214968JP | KNEE-NET-AS JIANG Zhirui | 256 | 4 | 5 |
| AS141694JP | ERMISLTD-AS-AP - Ermis Ltd. | 256 | — | 1 |
| AS59106JP | INET6 - Cyber and Internet Association | 256 | 65.5K | 2 |
| AS24252JP | JPRS-NAYUTA - Japan Registry Service Co., Ltd. | 256 | 65.5K | 2 |
| AS146972JP | TEC-JP-NET - TOYO Engineering Corporation | 256 | 1 | 2 |
| AS131895JP | OIST-NET - Okinawa Institute of science and technology | 256 | 1 | 2 |
| AS59124JP | KYOTO-PREF - KYOTO Prefectural Government | 256 | — | 1 |
| AS38215JP | SYUHEIUDA-AS-AP - Syuhei Uda | 256 | 65.5K | 3 |
| AS23634JP | E-DNS-JP - WIDE Project | 256 | 8.2K | 2 |
| AS152859JP | U-Cloud-3 - UNIADEX, LTD. | 256 | — | 1 |
| AS131894JP | U-Cloud-2 - UNIADEX, LTD. | 256 | — | 1 |
| AS146980JP | IOC - Tokyo Metropolitan College of Industrial Technology Infomation System Engineering Course | 256 | 1 | 2 |
| AS132211JP | FXCM-ASIA-AP - FX Corporate LLC | 256 | — | 1 |
| AS58651JP | GMO-REG-R2 - GMO Internet, Inc. | 256 | 1 | 2 |
| AS38629JP | OKN - NTT DOCOMO BUSINESS, Inc | 256 | 1 | 2 |
| AS133405JP | RETNKK-AS-AP - RETN Co., Ltd. | 256 | 1 | 2 |
| AS151376JP | SHR-TYO-NET - Solare Hotels and Resorts Co., Ltd. | 256 | — | 1 |