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How Japan ranks worldwide on dormant space, the transfer market, routing security and address density.
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 | 205 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 36 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 67 |
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| 0 |
| AS23625JP | TOKAI-WBS - TOKAI Communications Corporation | — | — | 0 |
| AS150364JP | AS150364-10 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS18089JP | HIKARI-NWC - KDDI Corporation | — | — | 0 |
| AS4691JP | DTI - Dream Train Internet Inc. | — | — | 0 |
| AS37896JP | AS37896-9 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS45673JP | OECU-NET - Osaka Electro-Communication University | — | — | 0 |
| AS55906JP | AS55906-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS59099JP | CLOUD-SDN-AS - BroadBand Tower, Inc. | — | — | 0 |
| AS37901JP | NTTE-NGN-AS - NIPPON TELEGRAPH AND TELEPHONE EAST CORPORATION | — | — | 0 |
| AS18270JP | TOIN - Toin University of Yokohama | — | — | 0 |
| AS9608JP | AS9608-18 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23636JP | AS23636-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23806JP | HBS - Chupicom Inc. | — | — | 0 |
| AS63786JP | MARCHE - Mercari, Inc. | — | — | 0 |
| AS37923JP | FIC - NTT DOCOMO BUSINESS, Inc. | — | — | 0 |
| AS9996JP | KDDIIP-VPN - KDDI Corporation | — | — | 0 |
| AS9375JP | AS9375-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS59119JP | HIT-NET - HIDATAKAYAMA CABLE NETWORK INC. | — | — | 0 |
| AS132496JP | SBIBITS-AS-AP - SBI BITS Co., Ltd. | — | — | 0 |
| AS4705JP | AS4705-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS10018JP | AS10018-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7504JP | AS7504-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9606JP | ISAS-AS - Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency | — | — | 0 |
| AS7528JP | AS7528-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9352JP | KUMAGAYA - KuMaGaYaNet | — | — | 0 |
| AS23622JP | TSURU-GAKUEN - Tsuru Gakuen | — | — | 0 |
| AS4698JP | INTERLINK - InterLink Co., Ltd. | — | — | 0 |
| AS4716JP | POWEREDCOM - KDDI CORPORATION | — | — | 0 |
| AS2521JP | AS2521-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS154661JP | Nintatsu-2 - Nintatsu Global Telecommunications Corporation | — | — | 0 |
| AS151031JP | TAO_AUCKLAND - AT&T TAO Cloud Access Node | — | — | 0 |
| AS45676JP | AS45676-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4727JP | BSS - KYODO PRINTING BUSINESS SOLUTIONS CO.,LTD | — | — | 0 |
| AS9610JP | AS9610-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS63524JP | ASN-EQIX-CLOUD-OS - Equinix Asia Pacific | — | — | 0 |
| AS63788JP | MOCHIYA-NET - MOCHIYA Inc. | — | — | 0 |
| AS151372JP | AS151372-2 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS7510JP | AS7510-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS146973JP | voip-enecom - Enecom,Inc. | — | — | 0 |
| AS23819JP | AS23819-47 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS134358JP | TAO_ASHBURN - AT&T TAO Cloud Access Node | — | — | 0 |
| AS23823JP | AS23823-51 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131898JP | YAHOO-3 - LY Corporation | — | — | 0 |
| AS18265JP | AS18265-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23796JP | AS23796-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151013JP | TAO_LONDON - AT&T TAO Cloud Access Node | — | — | 0 |