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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.
1,297 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 | 206 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
| SUN-SECBASE - University of Nagasaki |
| 256 |
| 1 |
| 2 |
| AS9935JP | AGNSCUS-HK - AGNS Customer AS | 256 | — | 1 |
| AS59115JP | CYBERDYNE - CYBERDYNE Inc. | 256 | 1 | 2 |
| AS18069JP | SOFTBANK - SoftBank Corp. | 256 | — | 1 |
| AS152874JP | JONET - JONET | 256 | 1 | 2 |
| AS152867JP | TCNET - Takaoka cable network | 256 | 4.1K | 2 |
| AS9609JP | BBIX-CDN - BBIX, Inc. | 256 | 1 | 2 |
| AS63800JP | SERVER-G - SERVER-G Group | 256 | 8 | 9 |
| AS137008JP | OPENTEXT-AS-AP-JP-TOK - 1120 Shimokuzawa Chuo-ku Sagamihara-shi Kanagawa-ken | 256 | — | 1 |
| AS55895JP | echigo-IX - N.S.Computer Service Co.,Ltd. | 256 | 1 | 2 |
| AS152870JP | KAICHI-NET - Incorporated Educational Institution Kaichigakuen | 256 | 1 | 2 |
| AS214968JP | KNEE-NET-AS JIANG Zhirui | 256 | 4 | 5 |
| AS133405JP | RETNKK-AS-AP - RETN Co., Ltd. | 256 | 1 | 2 |
| AS18131JP | DXNW - NTT DOCOMO BUSINESS, Inc. | 256 | 1 | 2 |
| AS131976JP | JPNAP-WEST - INTERNET MULTIFEED CO. | 256 | 69.6K | 3 |
| AS136796JP | CL-JP-AS - CORELINK JAPAN | 256 | — | 1 |
| AS4690JP | WIDE-SFO - WIDE Project | 256 | 256 | 2 |
| AS151376JP | SHR-TYO-NET - Solare Hotels and Resorts Co., Ltd. | 256 | — | 1 |
| AS131156JP | LAC-AS - LAC Co., Ltd. | 256 | 1 | 2 |
| AS55890JP | SUNTORY - Suntory Business Systems Ltd. | 256 | — | 1 |
| AS152869JP | ICJ-NET - ICJ, Inc. | 256 | — | 1 |
| AS131894JP | U-Cloud-2 - UNIADEX, LTD. | 256 | — | 1 |
| AS146984JP | JPNAP-EAST - INTERNET MULTIFEED CO. | 256 | 69.6K | 3 |
| AS131989JP | PFU-UMC-MS01 - PFU LIMITED | 256 | — | 1 |
| AS150685JP | CHINGKUO-AS-AP - Ching Kuo | 256 | 1 | 2 |
| AS131948JP | FORNEXT - FORNEXT Inc. | 256 | 1 | 2 |
| AS152859JP | U-Cloud-3 - UNIADEX, LTD. | 256 | — | 1 |
| AS131079JP | KANDANET4 - INTERNET MULTIFEED CO. | 256 | 1 | 2 |
| AS132119JP | TECPRESSO-NET-AP - TECPRESSO Inc. | 256 | 1 | 2 |
| AS151378JP | CSAISON-NET - Credit SAISON Co., Ltd. | 256 | — | 1 |
| AS139472JP | CMJK-AS-AP - Catalina Marketing Japan K.K. | 256 | 1 | 2 |
| AS9434JP | ABONE-AS-AP - Internet Initiative Japan, Inc. | 256 | — | 1 |
| AS59128JP | KMC - Kyoto University Microcomputer Club | 256 | 1 | 2 |
| AS131895JP | OIST-NET - Okinawa Institute of science and technology | 256 | 1 | 2 |
| AS63781JP | KFNET-AS - Kobayashi Family Net LLP | 256 | 65.5K | 2 |
| AS37905JP | BRASTEL-NET - Brastel Co.,Ltd | 256 | — | 1 |
| AS141694JP | ERMISLTD-AS-AP - Ermis Ltd. | 256 | — | 1 |
| AS23642JP | OBIS - OBIS | 256 | 1 | 2 |
| AS38215JP | SYUHEIUDA-AS-AP - Syuhei Uda | 256 | 65.5K | 3 |
| AS62184JP | MNO-AS Michal Nowak | 256 | 1 | 2 |
| AS146972JP | TEC-JP-NET - TOYO Engineering Corporation | 256 | 1 | 2 |
| AS135372JP | CSJI-AS-AP - Columbia Sportswear Japan Inc | 256 | — | 1 |
| AS131924JP | KAP-NET - Kansai Airports | 256 | 1 | 2 |
| AS63795JP | ROUTEL - RoutelNet | 256 | 4.1K | 2 |
| AS49671JP | DODO-NET DODO K.K. | 256 | — | 1 |
| AS140501JP | ITIVITI-AS-AP - Itiviti Japan K.K. | 256 | — | 1 |
| AS151389JP | Synergy-net - Synergy Cross Corporation | 256 | — | 1 |