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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 |
| 65.5K |
| 2 |
| AS131894JP | U-Cloud-2 - UNIADEX, LTD. | 256 | — | 1 |
| AS135372JP | CSJI-AS-AP - Columbia Sportswear Japan Inc | 256 | — | 1 |
| AS146986JP | SSC-3 - SUZUYO SHINWART CORPORATION | 256 | 256 | 2 |
| AS59124JP | KYOTO-PREF - KYOTO Prefectural Government | 256 | — | 1 |
| AS18069JP | SOFTBANK - SoftBank Corp. | 256 | — | 1 |
| AS146982JP | SHINNYO-LIVE - Shinnyo-en | 256 | — | 1 |
| AS152724JP | POINT72-AS-AP - Point72 Japan Limited | 256 | — | 1 |
| AS59106JP | INET6 - Cyber and Internet Association | 256 | 65.5K | 2 |
| AS150357JP | SUN-SECBASE - University of Nagasaki | 256 | 1 | 2 |
| AS62184JP | MNO-AS Michal Nowak | 256 | 1 | 2 |
| AS151379JP | NCJ - OPTAGE Inc. | 256 | — | 1 |
| AS137008JP | OPENTEXT-AS-AP-JP-TOK - 1120 Shimokuzawa Chuo-ku Sagamihara-shi Kanagawa-ken | 256 | — | 1 |
| AS151376JP | SHR-TYO-NET - Solare Hotels and Resorts Co., Ltd. | 256 | — | 1 |
| AS152869JP | ICJ-NET - ICJ, Inc. | 256 | — | 1 |
| AS131903JP | NRI-IVPN - Nomura Research Institute,Ltd. | 256 | — | 1 |
| AS38215JP | SYUHEIUDA-AS-AP - Syuhei Uda | 256 | 65.5K | 3 |
| AS141694JP | ERMISLTD-AS-AP - Ermis Ltd. | 256 | — | 1 |
| AS131079JP | KANDANET4 - INTERNET MULTIFEED CO. | 256 | 1 | 2 |
| AS134827JP | EYJAPAN-AS-AP - EY Japan Co., Ltd. | 256 | — | 1 |
| AS59128JP | KMC - Kyoto University Microcomputer Club | 256 | 1 | 2 |
| AS151378JP | CSAISON-NET - Credit SAISON Co., Ltd. | 256 | — | 1 |
| AS55895JP | echigo-IX - N.S.Computer Service Co.,Ltd. | 256 | 1 | 2 |
| AS55949JP | TECHNOPROHOLDINGS-JP - Technopro Holdings | 256 | — | 1 |
| AS59115JP | CYBERDYNE - CYBERDYNE Inc. | 256 | 1 | 2 |
| AS152874JP | JONET - JONET | 256 | — | 1 |
| AS58649JP | GMO-REG-R1 - GMO Internet, Inc. | 256 | 1 | 2 |
| AS132119JP | TECPRESSO-NET-AP - TECPRESSO Inc. | 256 | 1 | 2 |
| AS58651JP | GMO-REG-R2 - GMO Internet, Inc. | 256 | 1 | 2 |
| AS23634JP | E-DNS-JP - WIDE Project | 256 | 8.2K | 2 |
| AS133405JP | RETNKK-AS-AP - RETN Co., Ltd. | 256 | 1 | 2 |
| AS23761JP | XPEDITE-AS-JP - Xpedite Systems | 256 | — | 1 |
| AS45678JP | AAC-JP-AS - ABN AMRO Clearing Tokyo Co., Ltd. | 256 | — | 1 |
| AS37906JP | NETIRD-2 - GMO NetIRD, Inc. | 256 | 65.5K | 2 |
| AS139472JP | CMJK-AS-AP - Catalina Marketing Japan K.K. | 256 | 1 | 2 |
| AS131976JP | JPNAP-WEST - INTERNET MULTIFEED CO. | 256 | 69.6K | 3 |
| AS152184JP | TAMUKAINET-AS-AP - Tamukai Network | 256 | 265 | 11 |
| AS146972JP | TEC-JP-NET - TOYO Engineering Corporation | 256 | 1 | 2 |
| AS23833JP | MARUSAN-NET - Marusan Securities Co., LTD. | 256 | — | 1 |
| AS152870JP | KAICHI-NET - Incorporated Educational Institution Kaichigakuen | 256 | 1 | 2 |
| AS131895JP | OIST-NET - Okinawa Institute of science and technology | 256 | 1 | 2 |
| AS9609JP | BBIX-CDN - BBIX, Inc. | 256 | 1 | 2 |
| AS132211JP | FXCM-ASIA-AP - FX Corporate LLC | 256 | — | 1 |
| AS63800JP | SERVER-G - SERVER-G Group | 256 | 10 | 11 |
| AS214675JP | Starlamp Hidenori Matsuo | 256 | 4.7K | 18 |
| AS133180JP | STARBOWLTD-AS-AP - Starbow Ltd. | 256 | — | 1 |
| AS4690JP | WIDE-SFO - WIDE Project | 256 | 256 | 2 |