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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 |
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| — |
| 0 |
| AS23622JP | TSURU-GAKUEN - Tsuru Gakuen | — | — | 0 |
| AS55817JP | NTTECL-AS-AP - Nippon Telegraph and Telephone Corporation PF Labs | — | — | 0 |
| AS146970JP | BBS - BBSakura Networks, Inc. | — | — | 0 |
| AS17677JP | MIINET - ARTERIA Networks Corporation | — | — | 0 |
| AS4735JP | AS4735-53 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9928JP | INIXP-ASIA-AS-AP - Rapid-Firey (INIXP Asia) | — | — | 0 |
| AS17533JP | AS17533-31 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17801JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS23809JP | TV-NARUTO - Televi Naruto .CO.,LTD | — | — | 0 |
| AS23815JP | JPIX-RS - Japan Internet Xing Co., Ltd. | — | — | 0 |
| AS55892JP | NTTE-RIW - Nippon Telegraph and Telephone East Corporation | — | — | 0 |
| AS18095JP | REITAKU - Reitaku University | — | — | 0 |
| AS131968JP | MHBK-CLH-OS - Mizuho Bank, Ltd | — | — | 0 |
| AS142584JP | IMAGINGBAYINC-AS-AP - Imaging Bay, Inc. | — | — | 0 |
| AS146977JP | AS146977-10 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS151025JP | TAO_OSAKA - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151067JP | AS-VMW-HKG - VMWare Incorporation | — | — | 0 |
| AS2498JP | AS2498-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS135304JP | VMWARE-AS-AP - VMWare Incorporation | — | — | 0 |
| AS7685JP | AS7685-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS10008JP | AS10008-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24273JP | CANON - CANON INC. | — | — | 0 |
| AS24285JP | AS24285-38 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9592JP | PRISM - SOFTBANK TELECOM Corp. | — | — | 0 |
| AS59099JP | CLOUD-SDN-AS - BroadBand Tower, Inc. | — | — | 0 |
| AS151013JP | TAO_LONDON - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151034JP | TAO_MUMBAI3 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS147295JP | METROENGINESINC-AS-AP - Metro Engines Inc | — | — | 0 |
| AS151602JP | UTC-AS-AP - UD Trucks Corporation | — | — | 0 |
| AS4701JP | AS4701-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7528JP | AS7528-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9612JP | AS9612-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9620JP | AS9620-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18079JP | AS18079-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9363JP | FNETS - FUJITSU NETWORK SOLUTIONS LIMITED | — | — | 0 |
| AS37901JP | NTTE-NGN-AS - NIPPON TELEGRAPH AND TELEPHONE EAST CORPORATION | — | — | 0 |
| AS24274JP | AS24274-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37903JP | AS37903-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS63788JP | MOCHIYA-NET - MOCHIYA Inc. | — | — | 0 |
| AS151026JP | TAO_SAO_PAULO2 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151032JP | TAO_SEATTLE - AT&T TAO Cloud Access Node | — | — | 0 |
| AS4687JP | AS4687-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151015JP | TAO_FRANKFURT - AT&T TAO Cloud Access Node | — | — | 0 |
| AS4719JP | J-Stream-4 - J-Stream Inc. | — | — | 0 |
| AS9356JP | AS9356-8 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23835JP | AS23835-63 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |