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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 |
| AS23802JP | AS23802-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9598JP | MPLS-OCN - NTT DOCOMO BUSINESS,Inc. | — | — | 0 |
| AS17684JP | AS17684-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24121JP | ASN-EQIX-OSAKA-AP - Equinix Asia Pacific | — | 512 | 2 |
| AS17700JP | AS17700-28 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18269JP | KAI - Kai Creates Inc. | — | — | 0 |
| AS147058JP | UNGK-AS-AP - 1200-03-019901 | — | — | 0 |
| AS9743JP | NIPPONEDUIX-AS-AP - Nippon EDUIX | — | 1 | 1 |
| AS131083JP | MARCHE-LAB - Mercari, Inc. | — | — | 0 |
| AS131978JP | NTTCOM-VoIP - NTT DOCOMO BUSINESS,Inc. | — | — | 0 |
| AS146978JP | BBIX-Fukuoka - BBIX, Inc. | — | — | 0 |
| AS23625JP | TOKAI-WBS - TOKAI Communications Corporation | — | — | 0 |
| AS401655JP | TRANSVISIONNET - TransVision LLC | — | — | 0 |
| AS4683JP | AS4683-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7603JP | GENECOMPUTINGLTD-AS-AP - Gene Computing Ltd | — | — | 0 |
| AS9612JP | AS9612-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131985JP | MAT-NET - Maple Audio Technology Corp | — | — | 0 |
| AS152862JP | SOLTIEND - Shiojiri City | — | — | 0 |
| AS9995JP | AS9995-6 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS10033JP | IVANET-TYO-AP - iBasis Tokyo ICO | — | — | 0 |
| AS18122JP | KYOTO-IX - Advanced Software Technology & Management Research Institute of KYOTO | — | — | 0 |
| AS23640JP | BBIX - BBIX,Inc. | — | — | 0 |
| AS23813JP | SORUN - SORUN Corporation | — | — | 0 |
| AS59099JP | CLOUD-SDN-AS - BroadBand Tower, Inc. | — | — | 0 |
| AS131906JP | GAPINC-NET - Gap Japan K.K. | — | — | 0 |
| AS37921JP | AS37921-34 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23789JP | AS23789-17 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS152925JP | NARIYASUSANGYOKK-AS-AP - Nariyasu Sangyo Co., Ltd. | — | — | 0 |
| AS17681JP | AS17681-9 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151602JP | UTC-AS-AP - UD Trucks Corporation | — | — | 0 |
| AS7518JP | AS7518-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18288JP | AS18288-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18082JP | LASDEC - Japan Agency for Local Authority Information Systems | — | — | 0 |
| AS7661JP | AS7661-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17702JP | AS17702-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18095JP | REITAKU - Reitaku University | — | — | 0 |
| AS2503JP | AS2503-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131908JP | Intec-DCAN - INTEC Inc. | — | — | 0 |
| AS4719JP | J-Stream-4 - J-Stream Inc. | — | — | 0 |
| AS2524JP | RIM - EJWORKS CORPORATION | — | — | 0 |
| AS151024JP | TAO_TOKYO - AT&T TAO Cloud Access Node | — | — | 0 |
| AS4699JP | AS4699-17 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9599JP | INFOPEPPER - EJWORKS CORPORATION | — | — | 0 |
| AS18285JP | AS18285-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151036JP | TAO_SHANGHAI - AT&T TAO Cloud Access Node | — | — | 0 |
| AS18261JP | AS18261-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |