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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 |
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| 0 |
| AS151015JP | TAO_FRANKFURT - AT&T TAO Cloud Access Node | — | — | 0 |
| AS9928JP | INIXP-ASIA-AS-AP - Rapid-Firey (INIXP Asia) | — | — | 0 |
| AS17696JP | AS17696-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17795JP | NVJ-AP - Netvein.co.jp | — | — | 0 |
| AS23815JP | JPIX-RS - Japan Internet Xing Co., Ltd. | — | — | 0 |
| AS23834JP | AS23834-62 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23929JP | Ubiquitous-AS - Ubiquitous Corp. Data Center Network. | — | — | 0 |
| AS55892JP | NTTE-RIW - Nippon Telegraph and Telephone East Corporation | — | — | 0 |
| AS131081JP | InetCore4 - Intec NetCore, Inc. | — | — | 0 |
| AS131106JP | DATAHOTEL-JP - AS for DATAHOTEL, which is one of iDC in Japan, | — | — | 0 |
| AS23819JP | AS23819-47 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151029JP | TAO_MIAMI1 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS7662JP | AS7662-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151067JP | AS-VMW-HKG - VMWare Incorporation | — | — | 0 |
| AS2498JP | AS2498-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS135573JP | MBC-AS-AP - mediatti broadband communications | — | — | 0 |
| AS7685JP | AS7685-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS10008JP | AS10008-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18137JP | AS18137-17 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24294JP | AS24294-47 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS38630JP | AS38630-4 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS45673JP | OECU-NET - Osaka Electro-Communication University | — | — | 0 |
| AS18270JP | TOIN - Toin University of Yokohama | — | — | 0 |
| AS151034JP | TAO_MUMBAI3 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS154661JP | Nintatsu-2 - Nintatsu Global Telecommunications Corporation | — | — | 0 |
| AS400593JP | TRIDATA - tricloud | — | — | 0 |
| AS4701JP | AS4701-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4703JP | AS4703-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS147295JP | METROENGINESINC-AS-AP - Metro Engines Inc | — | — | 0 |
| AS9620JP | AS9620-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17528JP | AS17528-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23806JP | HBS - Chupicom Inc. | — | — | 0 |
| AS9363JP | FNETS - FUJITSU NETWORK SOLUTIONS LIMITED | — | — | 0 |
| AS9592JP | PRISM - SOFTBANK TELECOM Corp. | — | — | 0 |
| AS4702JP | AS4702-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24274JP | AS24274-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37903JP | AS37903-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151032JP | TAO_SEATTLE - AT&T TAO Cloud Access Node | — | — | 0 |
| AS152467JP | ETS-AS-AP - ETS TELECOM ETS TELCO | — | — | 0 |
| AS4687JP | AS4687-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151026JP | TAO_SAO_PAULO2 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS7507JP | AS7507-8 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9992JP | AS9992-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23748JP | CAT-AS-AP - Cat Networks K.K. | — | — | 0 |
| AS24297JP | FCN - University Public Corporation Osaka | — | — | 0 |
| AS18265JP | AS18265-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |