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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 |
| AS2502JP | TRAIN - The University of Tokyo | — | — | 0 |
| AS38895JP | AMAZON-AS-AP - Amazon.com Tech Telecom | — | — | 0 |
| AS37909JP | IKUEIKAN-NET - Ikueikan University | — | — | 0 |
| AS141348JP | BAYERHOLDINGLTD-AS-AP - Bayer Holding Ltd. | — | — | 0 |
| AS151401JP | CYBERVISIONHOSTING-AS-AP - Cybervision Hosting Co Ltd | — | — | 0 |
| AS17679JP | AS17679-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18082JP | LASDEC - Japan Agency for Local Authority Information Systems | — | — | 0 |
| AS9612JP | AS9612-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18287JP | AS18287-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9610JP | AS9610-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7528JP | AS7528-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS132373JP | ASIAN-WEB-JP - Neomet Aoyama BLDG.3F 2-7-13 Shibuya | — | — | 0 |
| AS10008JP | AS10008-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7512JP | WITH - WITH Network | — | — | 0 |
| AS63796JP | AS63796-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131991JP | HELP-NET - JAPAN MAYDAY SERVICE CO., LTD. | — | — | 0 |
| AS2498JP | AS2498-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131962JP | AS131962-58 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS131959JP | AS131959-55 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS4672JP | AS4672-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS2503JP | AS2503-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151024JP | TAO_TOKYO - AT&T TAO Cloud Access Node | — | — | 0 |
| AS9363JP | FNETS - FUJITSU NETWORK SOLUTIONS LIMITED | — | — | 0 |
| AS18122JP | KYOTO-IX - Advanced Software Technology & Management Research Institute of KYOTO | — | — | 0 |
| AS63808JP | AS63808-39 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS59101JP | AS59101-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18080JP | SOPIA - Sopiafons Co.,Ltd | — | — | 0 |
| AS55903JP | arrownet - Tokyo Stock Exchange, Inc. | — | — | 0 |
| AS18270JP | TOIN - Toin University of Yokohama | — | — | 0 |
| AS18067JP | HUMEIA - Humeia Corporation | — | — | 0 |
| AS37982JP | KIRINKK-AS-AP - Kirin K.K. | — | — | 0 |
| AS55892JP | NTTE-RIW - Nippon Telegraph and Telephone East Corporation | — | — | 0 |
| AS4700JP | NIJI-NET - Niji-Net Inc. | — | — | 0 |
| AS23797JP | AS23797-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS55817JP | NTTECL-AS-AP - Nippon Telegraph and Telephone Corporation PF Labs | — | — | 0 |
| AS18288JP | AS18288-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS56023JP | SMARTNET-AS-AP - SmartRams Co., Ltd. | — | — | 0 |
| AS133229JP | SKIPLLC-AS-AP - SKIP LLC | — | — | 0 |
| AS23802JP | AS23802-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS38222JP | SDCCIX-EAST - Shimane-Japan Internet Exchange | — | — | 0 |
| AS58792JP | closip-1 - closip Inc. | — | — | 0 |
| AS23812JP | AS23812-40 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23796JP | AS23796-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7673JP | ALLES - ejworks corporation | — | — | 0 |
| AS151384JP | BBIX-CACHE - BBIX, Inc. | — | — | 0 |
| AS152862JP | SOLTIEND - Shiojiri City | — | — | 0 |