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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 |
| 2.6K |
| — |
| 10 |
| AS63779JP | JUSTPLAYER - InfiniCloud Co. Ltd. | 2.6K | — | 2 |
| AS59103JP | SOFTETHER - SoftEther Corporation | 2.6K | 21K | 17 |
| AS131941JP | ENTSU-NET - Entsu Co.,Ltd. | 2.6K | — | 6 |
| AS23632JP | TVT-NET - TVT Tsuyama Co.,Ltd. | 2.6K | — | 2 |
| AS55898JP | YAHOO-CORP - LY Corporation | 2.6K | 65.5K | 6 |
| AS24253JP | J-Stream - J-Stream Inc. | 2.3K | 65.5K | 3 |
| AS63793JP | OPSBETTER - Japan OPS Better Co., Ltd. | 2.3K | 65.5K | 9 |
| AS24229JP | KOCHI-IX - IX-layers, Inc. | 2.3K | 65.5K | 5 |
| AS23818JP | JETINTERNET - JETINTERNET Corporation | 2.3K | — | 6 |
| AS59122JP | R-SYS - Ranger-Systems Co., Ltd. | 2K | — | 2 |
| AS131987JP | MCDR-NRT - MC Digital Realty, Inc. | 2K | 65.5K | 3 |
| AS37912JP | IPRIO-JP - IPRIO Corporation. | 2K | 65.5K | 2 |
| AS152858JP | TWC-NET - Woven by Toyota, Inc. | 2K | 131.1K | 6 |
| AS24250JP | MC-IDC - Miyagin Digital Solutions Co.,Ltd. | 2K | — | 1 |
| AS131961JP | DOKKYO-AS - Dokkyo University | 2K | — | 3 |
| AS131944JP | KADOKAWA-NET - KADOKAWA DWANGO CORPORATION | 2K | — | 8 |
| AS18076JP | WCE-IAMAS - Institute of Advanced Media Arts and Sciences | 2K | — | 1 |
| AS131971JP | AS131971-67 - JPNIC-4Byte-ASBLOCK-AP | 2K | 65.5K | 12 |
| AS131901JP | fidessa-kk - FIDESSA KK | 2K | — | 3 |
| AS131986JP | BB4U-NET - ITOCHU Cable Systems Corp. | 2K | 65.5K | 4 |
| AS131939JP | IPSISM-NET - IPS INC | 2K | — | 5 |
| AS23633JP | LOCAL-IX - Niigata Communication Service | 2K | — | 1 |
| AS24262JP | HIcom - HAMANASU INFORMATION Co., Ltd. | 2K | 65.5K | 2 |
| AS63774JP | KAMOIKE-NET - Kamoike.net LLP | 2K | 65.5K | 12 |
| AS131969JP | SSC-2 - Suzuyo Shinwart Corporation | 2K | 258 | 6 |
| AS136506JP | LEONCOLTD-AS-AP - LEON CO.LTD | 2K | — | 8 |
| AS23826JP | DAIDO-IT - Daido University | 2K | — | 3 |
| AS24290JP | HEARTNET - Heart Network Co.,LTD | 2K | — | 1 |
| AS131907JP | IWAMI-NET - Iwami Cablevision Co.,Ltd. | 2K | — | 4 |
| AS38642JP | YOSHIZOU - Yoshizou XYZ Solutions | 2K | — | 1 |
| AS24512JP | HAL-Internet - HAL Internet, Internet Service Provider, Tottori, Japan | 2K | — | 1 |
| AS133458JP | FSCJCL-AS-AP - FPT Smart Cloud Japan Co., Ltd | 2K | 257 | 8 |
| AS58784JP | RIS - Rissho University | 2K | — | 1 |
| AS37915JP | Ke-net - Wakayama Prefectural Government | 2K | — | 1 |
| AS55383JP | IDC-JP - YYY Group, Inc. | 2K | — | 8 |
| AS18091JP | TEIKYO-U - Teikyo University | 2K | — | 3 |
| AS59095JP | ACCELIA-W - ACCELIA | 2K | — | 1 |
| AS131904JP | CYBERFEELINC-JP - Cyber Feel Inc. | 1.8K | — | 6 |
| AS37889JP | JPARC-NET - J-PARC Center | 1.8K | — | 3 |
| AS38643JP | U-Cloud - UNIADEX, LTD. | 1.8K | — | 3 |
| AS139345JP | HYVEMANAGEDHOSTINGCORPINC-AS-AP - Hyve Managed Hosting Corp Inc | 1.8K | 7 | 7 |
| AS131914JP | DD-NET - Rakuten Group, Inc. | 1.8K | — | 5 |
| AS139358JP | KANSUIUN-AS-AP - Kansuiun Co., Ltd | 1.8K | 273 | 10 |
| AS4774JP | ABONE-AS - A-Bone by Internet Initiative Japan Inc. | 1.8K | — | 4 |
| AS141757JP | ZJC-AS-AP - Zoho Japan Corporation | 1.8K | 2 | 7 |
| AS55888JP | Nintatsu - Nintatsu Global Telecommunications Corporation | 1.7K | — | 6 |