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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.
1,303 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. | 4.2M | 269 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
| 256 |
| — |
| 1 |
| AS37906JP | NETIRD-2 - GMO NetIRD, Inc. | 256 | 65.5K | 2 |
| AS131984JP | JOCDN - JOCDN Inc. | 256 | 1 | 2 |
| AS146980JP | IOC - Tokyo Metropolitan College of Industrial Technology Infomation System Engineering Course | 256 | 1 | 2 |
| AS154090JP | FINSTADIUMX-AS-AP - FinStadiumX Co., Ltd. | 256 | — | 1 |
| AS131079JP | KANDANET4 - INTERNET MULTIFEED CO. | 256 | 1 | 2 |
| AS24287JP | TEIN2-JP - National Institute of Informatics | 256 | 1 | 2 |
| AS139472JP | CMJK-AS-AP - Catalina Marketing Japan K.K. | 256 | 1 | 2 |
| AS49671JP | DODO-NET DODO K.K. | 256 | — | 1 |
| AS146984JP | JPNAP-EAST - INTERNET MULTIFEED CO. | 256 | 69.6K | 3 |
| AS38647JP | GeekN-NetLab - NEI's NetLab | 256 | — | 1 |
| AS63795JP | ROUTEL - RoutelNet | 256 | 4.1K | 2 |
| AS135372JP | CSJI-AS-AP - Columbia Sportswear Japan Inc | 256 | — | 1 |
| AS63780JP | BIRDIE-NET - dual&Co. Inc. | 256 | 16.4K | 2 |
| AS9434JP | ABONE-AS-AP - Internet Initiative Japan, Inc. | 256 | — | 1 |
| AS131895JP | OIST-NET - Okinawa Institute of science and technology | 256 | 1 | 2 |
| AS131964JP | CYBERHOME3 - FAMILYNET JAPAN CORPORATION | 256 | 1 | 2 |
| AS132119JP | TECPRESSO-NET-AP - TECPRESSO Inc. | 256 | 1 | 2 |
| AS45678JP | AAC-JP-AS - ABN AMRO Clearing Tokyo Co., Ltd. | 256 | — | 1 |
| AS131894JP | U-Cloud-2 - UNIADEX, LTD. | 256 | — | 1 |
| AS134827JP | EYJAPAN-AS-AP - EY Japan Co., Ltd. | 256 | — | 1 |
| AS137008JP | OPENTEXT-AS-AP-JP-TOK - 1120 Shimokuzawa Chuo-ku Sagamihara-shi Kanagawa-ken | 256 | — | 1 |
| AS152184JP | TAMUKAINET-AS-AP - Tamukai Network | 256 | 264 | 10 |
| AS23774JP | A-DNS-JP - Japan Registry Service Co., Ltd. | 256 | 65.5K | 2 |
| AS55373JP | TRI-KOBE-NET - Foundation for Biomedical Research and Innovation at Kobe | 256 | — | 1 |
| AS45217JP | TORA-TRADING-SERVICES - Tora Trading Services Ltd. | 256 | — | 1 |
| AS131948JP | FORNEXT - FORNEXT Inc. | 256 | 1 | 2 |
| AS9609JP | BBIX-CDN - BBIX, Inc. | 256 | 1 | 2 |
| AS62184JP | MNO-AS Michal Nowak | 256 | 1 | 2 |
| AS152867JP | TCNET - Takaoka cable network | 256 | 4.1K | 2 |
| AS154936JP | TAIPEI101-AS-AP - TAIPEI101 NETWORK LLC | 256 | — | 1 |
| AS133180JP | STARBOWLTD-AS-AP - Starbow Ltd. | 256 | — | 1 |
| AS59128JP | KMC - Kyoto University Microcomputer Club | 256 | 1 | 2 |
| AS152869JP | ICJ-NET - ICJ, Inc. | 256 | — | 1 |
| AS37905JP | BRASTEL-NET - Brastel Co.,Ltd | 256 | — | 1 |
| AS214675JP | Starlamp Hidenori Matsuo | 256 | 4.7K | 15 |
| AS152870JP | KAICHI-NET - Incorporated Educational Institution Kaichigakuen | 256 | 1 | 2 |
| AS59115JP | CYBERDYNE - CYBERDYNE Inc. | 256 | 1 | 2 |
| AS150357JP | SUN-SECBASE - University of Nagasaki | 256 | 1 | 2 |
| AS58651JP | GMO-REG-R2 - GMO Internet, Inc. | 256 | 1 | 2 |
| AS150685JP | CHINGKUO-AS-AP - Ching Kuo | 256 | 1 | 2 |
| AS38644JP | KANDANET - INTERNET MULTIFEED CO. | 256 | 1 | 2 |
| AS55890JP | SUNTORY - Suntory Business Systems Ltd. | 256 | — | 1 |
| AS59124JP | KYOTO-PREF - KYOTO Prefectural Government | 256 | — | 1 |
| AS38629JP | OKN - NTT DOCOMO BUSINESS, Inc | 256 | 1 | 2 |
| AS150368JP | TESTBED-KLN - SERVER-G Group | 256 | 3 | 4 |
| AS131903JP | NRI-IVPN - Nomura Research Institute,Ltd. | 256 | — | 1 |