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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.
1,300 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. | 4M | 236 |
| 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 |
| AS37899JP | NTTW-NGN-AS - NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION | — | — | 0 |
| AS151384JP | BBIX-CACHE - BBIX, Inc. | — | — | 0 |
| AS151389JP | Synergy-net - Synergy Cross Corporation | — | — | 0 |
| AS17528JP | AS17528-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17703JP | AS17703-31 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS59113JP | RJV6-NET - RICOH JAPAN Corporation | — | — | 0 |
| AS10124JP | AMAZON-AP-RESOURCES-AS-AP-NRT - Amazon Data Services Japan KK | — | — | 0 |
| AS9620JP | AS9620-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4700JP | NIJI-NET - Niji-Net Inc. | — | — | 0 |
| AS17949JP | TEU - Tokyo University of Technorogy | — | — | 0 |
| AS58792JP | closip-1 - closip Inc. | — | — | 0 |
| AS37926JP | AS37926-39 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37984JP | CKADMIN-AS-JP - Chikushi Jogakuen University, Non-transit AS. | — | — | 0 |
| AS23801JP | AS23801-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24567JP | QTINC-AS-AP - QT Inc. | — | — | 0 |
| AS17933JP | NTT-EAST - Nippon Telegraph and Telephone East Corporation | — | — | 0 |
| AS7508JP | AS7508-9 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17695JP | MLJS - MLJS | — | — | 0 |
| AS17524JP | OPTAGE-17524 - OPTAGE Inc. | — | — | 0 |
| AS2528JP | AS2528-32 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151401JP | CYBERVISIONHOSTING-AS-AP - Cybervision Hosting Co Ltd | — | — | 0 |
| AS131083JP | MARCHE-LAB - Mercari, Inc. | — | — | 0 |
| AS4712JP | JT-Net - JAPAN TOBACCO INC. | — | — | 0 |
| AS24274JP | AS24274-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9598JP | MPLS-OCN - NTT DOCOMO BUSINESS,Inc. | — | — | 0 |
| AS152925JP | NARIYASUSANGYOKK-AS-AP - Nariyasu Sangyo Co., Ltd. | — | — | 0 |
| AS9359JP | AS9359-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17702JP | AS17702-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18270JP | TOIN - Toin University of Yokohama | — | — | 0 |
| AS63000JP | US-CORE - Auk LLC | — | — | 0 |
| AS151074JP | AS-VMW-TPE - VMWare Incorporation | — | — | 0 |
| AS9363JP | FNETS - FUJITSU NETWORK SOLUTIONS LIMITED | — | — | 0 |
| AS131978JP | NTTCOM-VoIP - NTT DOCOMO BUSINESS,Inc. | — | — | 0 |
| AS45682JP | ASN-EXCITE - Excite Japan Co., Ltd. | — | — | 0 |
| AS133445JP | FIVE9INC-AS-AP - Five9, Inc. | — | — | 0 |
| AS55817JP | NTTECL-AS-AP - Nippon Telegraph and Telephone Corporation PF Labs | — | — | 0 |
| AS59101JP | AS59101-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS59099JP | CLOUD-SDN-AS - BroadBand Tower, Inc. | — | — | 0 |
| AS131975JP | OedoTelecom - Oedo Telecom Inc | — | — | 0 |
| AS23835JP | AS23835-63 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS55896JP | VIDEX - Videx Inc. | — | — | 0 |
| AS45686JP | RFEED - INTERNET MULTIFEED CO. | — | — | 0 |
| AS23800JP | AS23800-28 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23796JP | AS23796-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS38632JP | XCON - cross-connect niigata co.,ltd. | — | — | 0 |
| AS17503JP | AS17503-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |