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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 |
| — |
| 1 |
| AS9367JP | ISCT - Institute of Science Tokyo | 65.8K | 65.5K | 3 |
| AS17932JP | JAIST - Japan Advanced Institute of Science and Technology | 65.8K | 1 | 3 |
| AS9591JP | NIFS - National Institute for Fusion Science | 65.8K | — | 2 |
| AS131158JP | NAIST-AS - Nara Institute of Science and Technology, National University Corporation | 66K | 1 | 3 |
| AS150359JP | CTTNET - Cable Television TOYAMA Inc. | 66K | 65.5K | 3 |
| AS150363JP | THIN-NET - SoftEther Corporation | 66.3K | — | 3 |
| AS24261JP | mie-u - Mie University | 66.3K | — | 3 |
| AS23720JP | RMNI-AS-AP - Rakuten Mobile Network, Inc. | 66.6K | 65.5K | 4 |
| AS23816JP | YAHOO - LY Corporation | 66.6K | 65.5K | 8 |
| AS37919JP | SEGASAMMY - SEGA SAMMY HOLDINGS INC. | 66.6K | 1 | 3 |
| AS9366JP | SOLITON - SOLITON-NET | 66.8K | — | 6 |
| AS38634JP | DWANGO - DWANGO Co.,Ltd. | 67.1K | — | 4 |
| AS4730JP | ODINS - Osaka University | 67.6K | — | 2 |
| AS55392JP | MF-NATIVE6-W - INTERNET MULTIFEED CO. | 67.6K | 1.1M | 7 |
| AS55391JP | MF-NATIVE6-E - INTERNET MULTIFEED CO. | 67.6K | 1.1M | 7 |
| AS17947JP | S-UTOPIA - SAKURA KCS Corporation. | 69.6K | — | 2 |
| AS38654JP | INES-NETWORK - INES Corporation. | 69.6K | — | 5 |
| AS9615JP | TEES - TOYOHASHI CABLE NETWORK INC. | 71.7K | — | 10 |
| AS59127JP | NCV - Newmedia Corporation | 71.7K | 81.9K | 21 |
| AS17939JP | MCN-NET01 - miyazaki cabletelevision network Co.,LTD | 71.7K | 65.5K | 11 |
| AS23781JP | Toyama-AN-AS - Toyama University | 72.7K | — | 4 |
| AS10000JP | NCM - Nagasaki Cable Media Inc. | 73.7K | 65.5K | 21 |
| AS2523JP | ITRC-NET - Internet Technology Research Consortium | 73.7K | 65.5K | 4 |
| AS2505JP | HEPNET-J - High Energy Accelerator Research Organization, KEK | 74.2K | — | 4 |
| AS9621JP | II-OKINAWA - Okinawa Telecommunication Network Co.,Inc | 76.8K | 65.5K | 15 |
| AS7672JP | FITWEB - Hokuden Information System Service Co.,Ltd. | 76.8K | 65.5K | 21 |
| AS38628JP | WINK-NET - HIMEJI CABLE TELEVISION CORPORATION | 77.8K | 65.5K | 17 |
| AS7511JP | SYNAPSE - SYNAPSE Co.,Ltd. | 78.8K | 65.5K | 20 |
| AS18260JP | e-catv - EHIME CATV CO.,LTD. | 79.6K | 65.5K | 28 |
| AS18092JP | CSF - Kyushu Tele Communications Company | 80.1K | 65.5K | 51 |
| AS9600JP | SONYTELECOM - So-net Corporation | 82.9K | 65.5K | 16 |
| AS131161JP | NECCN - NEC Corporation | 83.2K | 69.6K | 9 |
| AS9466JP | UUNET-JP-AP - UUNET Japan Limited | 84.5K | 512 | 23 |
| AS18136JP | CTA - JCOM Co., Ltd. | 86K | — | 18 |
| AS24282JP | KIR - KAGOYA JAPAN Inc. | 89.1K | 65.5K | 8 |
| AS9378JP | CABLENET - JCOM Co., Ltd. | 90.1K | — | 36 |
| AS4678JP | FINE - Canon IT Solutions Inc. | 90.1K | 65.5K | 4 |
| AS55374JP | FJcloud-East - FUJITSU LIMITED | 90.9K | 4 | 132 |
| AS18150JP | SNI-JP - NetComBB Co.,Ltd. | 91.1K | — | 7 |
| AS9993JP | CTC-ODC - ITOCHU Techno-Solutions Corporation | 91.1K | 65.5K | 10 |
| AS17534JP | NSK - NSK Co.,Ltd. | 94.2K | 131.1K | 25 |
| AS18283JP | CCV - Chupicom Inc. | 94.2K | 65.5K | 98 |
| AS17961JP | MITENE - mitene internet co., ltd. | 100.4K | 65.5K | 15 |
| AS17686JP | ACCELIA - ACCELIA | 107K | 65.5K | 19 |
| AS4711JP | INTEC - INTEC Inc. | 108.5K | 65.5K | 21 |
| AS10021JP | KVH - KVH Co.,Ltd | 110.8K | 65.5K | 49 |