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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.
| AS | Holder | IPv4 | Prefixes |
|---|---|---|---|
| AS17676JP | GIGAINFRA - SoftBank Corp. | 49.7M | 490 |
| AS4713JP | OCN - NTT DOCOMO BUSINESS,Inc. | 28.6M | 189 |
| AS2516JP | KDDI - KDDI CORPORATION | 18.2M | 578 |
| AS9824JP | JTCL-JP-AS - JCOM Co., Ltd. | 10.4M | 297 |
| AS2907JP | SINET-AS - Research Organization of Information and Systems, National Institute of Informatics | 9M | 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 |
Share of announced address space covered by valid Route Origin Authorizations.
1,303 autonomous systems registered to Japan. Click an AS for detail.
| AS | Holder | IPv4 ↓ | IPv6 /48 | Prefixes |
|---|---|---|---|---|
| AS131951JP | SSC - Suzuyo Shinwart Corporation | 256 | 256 | 2 |
| AS38649JP | UEC-EXP - The University of Electro-Communications | 256 | — | 1 |
| AS152724JP | POINT72-AS-AP - Point72 Japan Limited | 256 | — | 1 |
| AS131913JP | AS131913-9 - JPNIC-4Byte-ASBLOCK-AP | 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 |