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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 |
| JONET - JONET |
| 256 |
| — |
| 1 |
| AS146982JP | SHINNYO-LIVE - Shinnyo-en | 256 | — | 1 |
| AS131894JP | U-Cloud-2 - UNIADEX, LTD. | 256 | — | 1 |
| AS23761JP | XPEDITE-AS-JP - Xpedite Systems | 256 | — | 1 |
| AS23634JP | E-DNS-JP - WIDE Project | 256 | 8.2K | 2 |
| AS23642JP | OBIS - OBIS | 256 | 1 | 2 |
| AS45678JP | AAC-JP-AS - ABN AMRO Clearing Tokyo Co., Ltd. | 256 | — | 1 |
| AS133405JP | RETNKK-AS-AP - RETN Co., Ltd. | 256 | 1 | 2 |
| AS151377JP | SHR-OSA-NET - Solare Hotels and Resorts Co., Ltd. | 256 | — | 1 |
| AS152859JP | U-Cloud-3 - UNIADEX, LTD. | 256 | — | 1 |
| AS55895JP | echigo-IX - N.S.Computer Service Co.,Ltd. | 256 | 1 | 2 |
| AS24252JP | JPRS-NAYUTA - Japan Registry Service Co., Ltd. | 256 | 65.5K | 2 |
| AS131989JP | PFU-UMC-MS01 - PFU LIMITED | 256 | — | 1 |
| AS63800JP | SERVER-G - SERVER-G Group | 256 | 10 | 11 |
| AS38649JP | UEC-EXP - The University of Electro-Communications | 256 | — | 1 |
| AS151376JP | SHR-TYO-NET - Solare Hotels and Resorts Co., Ltd. | 256 | — | 1 |
| AS55901JP | SCEI-NET - Sony Computer Entertainment Inc | 256 | 1 | 2 |
| AS133780JP | QMC-AS-AP - Quantum Mesh Co.,Ltd. | 256 | 1 | 2 |
| AS146972JP | TEC-JP-NET - TOYO Engineering Corporation | 256 | 1 | 2 |
| AS9434JP | ABONE-AS-AP - Internet Initiative Japan, Inc. | 256 | — | 1 |
| AS23774JP | A-DNS-JP - Japan Registry Service Co., Ltd. | 256 | 65.5K | 2 |
| AS9935JP | AGNSCUS-HK - AGNS Customer AS | 256 | — | 1 |
| AS58651JP | GMO-REG-R2 - GMO Internet, Inc. | 256 | 1 | 2 |
| AS23833JP | MARUSAN-NET - Marusan Securities Co., LTD. | 256 | — | 1 |
| AS134827JP | EYJAPAN-AS-AP - EY Japan Co., Ltd. | 256 | — | 1 |
| AS18131JP | DXNW - NTT DOCOMO BUSINESS, Inc. | 256 | 1 | 2 |
| AS131895JP | OIST-NET - Okinawa Institute of science and technology | 256 | 1 | 2 |
| AS154936JP | TAIPEI101-AS-AP - TAIPEI101 NETWORK LLC | 256 | — | 1 |
| AS151379JP | NCJ - OPTAGE Inc. | 256 | — | 1 |
| AS55373JP | TRI-KOBE-NET - Foundation for Biomedical Research and Innovation at Kobe | 256 | — | 1 |
| AS63780JP | BIRDIE-NET - dual&Co. Inc. | 256 | 16.4K | 2 |
| AS38629JP | OKN - NTT DOCOMO BUSINESS, Inc | 256 | 1 | 2 |
| AS38644JP | KANDANET - INTERNET MULTIFEED CO. | 256 | 1 | 2 |
| AS132610JP | JPNIC-NET-JP - Japan Network Information Center | 256 | 1 | 2 |
| AS63795JP | ROUTEL - RoutelNet | 256 | 4.1K | 2 |
| AS38647JP | GeekN-NetLab - NEI's NetLab | 256 | — | 1 |
| AS131964JP | CYBERHOME3 - FAMILYNET JAPAN CORPORATION | 256 | 1 | 2 |
| AS214968JP | KNEE-NET-AS JIANG Zhirui | 256 | 4 | 5 |
| AS49671JP | DODO-NET DODO K.K. | 256 | — | 1 |
| AS132119JP | TECPRESSO-NET-AP - TECPRESSO Inc. | 256 | 1 | 2 |
| AS131913JP | AS131913-9 - JPNIC-4Byte-ASBLOCK-AP | 256 | — | 1 |
| AS131903JP | NRI-IVPN - Nomura Research Institute,Ltd. | 256 | — | 1 |
| AS131156JP | LAC-AS - LAC Co., Ltd. | 256 | 1 | 2 |
| AS139472JP | CMJK-AS-AP - Catalina Marketing Japan K.K. | 256 | 1 | 2 |
| AS131948JP | FORNEXT - FORNEXT Inc. | 256 | 1 | 2 |
| AS131984JP | JOCDN - JOCDN Inc. | 256 | 1 | 2 |
| AS154090JP | FINSTADIUMX-AS-AP - FinStadiumX Co., Ltd. | 256 | — | 1 |