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How Japan ranks worldwide on dormant space, the transfer market, routing security and address density.
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 | 205 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 36 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 67 |
| 256 |
| 1 |
| 2 |
| AS63800JP | SERVER-G - SERVER-G Group | 256 | 10 | 11 |
| AS58651JP | GMO-REG-R2 - GMO Internet, Inc. | 256 | 1 | 2 |
| AS59111JP | AIU-NET - Akita International University | 256 | 1 | 2 |
| AS23761JP | XPEDITE-AS-JP - Xpedite Systems | 256 | — | 1 |
| AS152724JP | POINT72-AS-AP - Point72 Japan Limited | 256 | — | 1 |
| AS141694JP | ERMISLTD-AS-AP - Ermis Ltd. | 256 | — | 1 |
| AS150685JP | CHINGKUO-AS-AP - Ching Kuo | 256 | 1 | 2 |
| AS135372JP | CSJI-AS-AP - Columbia Sportswear Japan Inc | 256 | — | 1 |
| AS146986JP | SSC-3 - SUZUYO SHINWART CORPORATION | 256 | 256 | 2 |
| AS152869JP | ICJ-NET - ICJ, Inc. | 256 | — | 1 |
| AS55373JP | TRI-KOBE-NET - Foundation for Biomedical Research and Innovation at Kobe | 256 | — | 1 |
| AS137008JP | OPENTEXT-AS-AP-JP-TOK - 1120 Shimokuzawa Chuo-ku Sagamihara-shi Kanagawa-ken | 256 | — | 1 |
| AS9935JP | AGNSCUS-HK - AGNS Customer AS | 256 | — | 1 |
| AS4690JP | WIDE-SFO - WIDE Project | 256 | 256 | 2 |
| AS24287JP | TEIN2-JP - National Institute of Informatics | 256 | 1 | 2 |
| AS63780JP | BIRDIE-NET - dual&Co. Inc. | 256 | 16.4K | 2 |
| AS152184JP | TAMUKAINET-AS-AP - Tamukai Network | 256 | 265 | 11 |
| AS131951JP | SSC - Suzuyo Shinwart Corporation | 256 | 256 | 2 |
| AS214675JP | Starlamp Hidenori Matsuo | 256 | 4.7K | 18 |
| AS133405JP | RETNKK-AS-AP - RETN Co., Ltd. | 256 | 1 | 2 |
| AS59106JP | INET6 - Cyber and Internet Association | 256 | 65.5K | 2 |
| AS23634JP | E-DNS-JP - WIDE Project | 256 | 8.2K | 2 |
| AS133180JP | STARBOWLTD-AS-AP - Starbow Ltd. | 256 | — | 1 |
| AS55949JP | TECHNOPROHOLDINGS-JP - Technopro Holdings | 256 | — | 1 |
| AS17905JP | COMMERZBANK-AP-DRT - Commerzbank AG | 256 | — | 1 |
| AS152870JP | KAICHI-NET - Incorporated Educational Institution Kaichigakuen | 256 | 1 | 2 |
| AS139472JP | CMJK-AS-AP - Catalina Marketing Japan K.K. | 256 | 1 | 2 |
| AS23833JP | MARUSAN-NET - Marusan Securities Co., LTD. | 256 | — | 1 |
| AS55890JP | SUNTORY - Suntory Business Systems Ltd. | 256 | — | 1 |
| AS131895JP | OIST-NET - Okinawa Institute of science and technology | 256 | 1 | 2 |
| AS151379JP | NCJ - OPTAGE Inc. | 256 | — | 1 |
| AS131156JP | LAC-AS - LAC Co., Ltd. | 256 | 1 | 2 |
| AS24252JP | JPRS-NAYUTA - Japan Registry Service Co., Ltd. | 256 | 65.5K | 2 |
| AS131976JP | JPNAP-WEST - INTERNET MULTIFEED CO. | 256 | 69.6K | 3 |
| AS140501JP | ITIVITI-AS-AP - Itiviti Japan K.K. | 256 | — | 1 |
| AS38649JP | UEC-EXP - The University of Electro-Communications | 256 | — | 1 |
| AS131079JP | KANDANET4 - INTERNET MULTIFEED CO. | 256 | 1 | 2 |
| AS9609JP | BBIX-CDN - BBIX, Inc. | 256 | 1 | 2 |
| AS23774JP | A-DNS-JP - Japan Registry Service Co., Ltd. | 256 | 65.5K | 2 |
| AS38629JP | OKN - NTT DOCOMO BUSINESS, Inc | 256 | 1 | 2 |
| AS132211JP | FXCM-ASIA-AP - FX Corporate LLC | 256 | — | 1 |
| AS147295JP | METROENGINESINC-AS-AP - Metro Engines Inc | 256 | — | 1 |
| AS945JP | JP-77-20220621 HAONAN YANG | 256 | — | 1 |
| AS18131JP | DXNW - NTT DOCOMO BUSINESS, Inc. | 256 | 1 | 2 |
| AS152859JP | U-Cloud-3 - UNIADEX, LTD. | 256 | — | 1 |
| AS131964JP | CYBERHOME3 - FAMILYNET JAPAN CORPORATION | 256 | 1 | 2 |