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How Japan ranks worldwide on dormant space, the transfer market, routing security and address density.
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 | 205 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 36 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 67 |
| 2.6K |
| — |
| 2 |
| AS131896JP | SSI-Lab - SSI Lab Inc. | 2.6K | — | 9 |
| AS7530JP | BBTower-Lab - BroadBand Tower, Inc. | 2.6K | 65.5K | 4 |
| AS63779JP | JUSTPLAYER - InfiniCloud Co. Ltd. | 2.6K | — | 2 |
| AS131941JP | ENTSU-NET - Entsu Co.,Ltd. | 2.6K | — | 6 |
| AS55898JP | YAHOO-CORP - LY Corporation | 2.6K | 65.5K | 6 |
| AS58789JP | DUNAMIS - DUNAMIS Co.,Ltd | 2.6K | — | 10 |
| AS131955JP | KCNET - Kyoutou Cable Net Co Ltd | 2.6K | — | 3 |
| AS24253JP | J-Stream - J-Stream Inc. | 2.3K | 65.5K | 3 |
| AS23818JP | JETINTERNET - JETINTERNET Corporation | 2.3K | — | 6 |
| AS24229JP | KOCHI-IX - IX-layers, Inc. | 2.3K | 65.5K | 5 |
| AS37915JP | Ke-net - Wakayama Prefectural Government | 2K | — | 1 |
| AS131969JP | SSC-2 - Suzuyo Shinwart Corporation | 2K | 258 | 6 |
| AS131971JP | AS131971-67 - JPNIC-4Byte-ASBLOCK-AP | 2K | 65.5K | 12 |
| AS59103JP | SOFTETHER - SoftEther Corporation | 2K | 20.7K | 15 |
| AS136506JP | LEONCOLTD-AS-AP - LEON CO.LTD | 2K | — | 8 |
| AS24512JP | HAL-Internet - HAL Internet, Internet Service Provider, Tottori, Japan | 2K | — | 1 |
| AS152324JP | M3XNETCOLTD-AS-AP - 3XNET Co., Ltd. | 2K | — | 8 |
| AS131939JP | IPSISM-NET - IPS INC | 2K | — | 5 |
| AS131907JP | IWAMI-NET - Iwami Cablevision Co.,Ltd. | 2K | — | 4 |
| AS18091JP | TEIKYO-U - Teikyo University | 2K | — | 3 |
| AS59122JP | R-SYS - Ranger-Systems Co., Ltd. | 2K | — | 2 |
| AS24262JP | HIcom - HAMANASU INFORMATION Co., Ltd. | 2K | 65.5K | 2 |
| AS131901JP | fidessa-kk - FIDESSA KK | 2K | — | 3 |
| AS152858JP | TWC-NET - Woven by Toyota, Inc. | 2K | 131.1K | 6 |
| AS59095JP | ACCELIA-W - ACCELIA | 2K | — | 1 |
| AS58784JP | RIS - Rissho University | 2K | — | 1 |
| AS24250JP | MC-IDC - Miyagin Digital Solutions Co.,Ltd. | 2K | — | 1 |
| AS55383JP | IDC-JP - YYY Group, Inc. | 2K | — | 8 |
| AS131986JP | BB4U-NET - ITOCHU Cable Systems Corp. | 2K | 65.5K | 4 |
| AS63774JP | KAMOIKE-NET - Kamoike.net LLP | 2K | 65.5K | 12 |
| AS131944JP | KADOKAWA-NET - KADOKAWA DWANGO CORPORATION | 2K | — | 8 |
| AS23633JP | LOCAL-IX - Niigata Communication Service | 2K | — | 1 |
| AS131987JP | MCDR-NRT - MC Digital Realty, Inc. | 2K | 65.5K | 3 |
| AS133458JP | FSCJCL-AS-AP - FPT Smart Cloud Japan Co., Ltd | 2K | 257 | 8 |
| AS38642JP | YOSHIZOU - Yoshizou XYZ Solutions | 2K | — | 1 |
| AS131961JP | DOKKYO-AS - Dokkyo University | 2K | — | 3 |
| AS37912JP | IPRIO-JP - IPRIO Corporation. | 2K | 65.5K | 2 |
| AS23826JP | DAIDO-IT - Daido University | 2K | — | 3 |
| AS24290JP | HEARTNET - Heart Network Co.,LTD | 2K | — | 1 |
| AS18076JP | WCE-IAMAS - Institute of Advanced Media Arts and Sciences | 2K | — | 1 |
| AS4774JP | ABONE-AS - A-Bone by Internet Initiative Japan Inc. | 1.8K | — | 4 |
| AS139358JP | KANSUIUN-AS-AP - Kansuiun Co., Ltd | 1.8K | 273 | 10 |
| AS37889JP | JPARC-NET - J-PARC Center | 1.8K | — | 3 |
| AS131904JP | CYBERFEELINC-JP - Cyber Feel Inc. | 1.8K | — | 6 |
| AS38643JP | U-Cloud - UNIADEX, LTD. | 1.8K | — | 3 |
| AS139345JP | HYVEMANAGEDHOSTINGCORPINC-AS-AP - Hyve Managed Hosting Corp Inc | 1.8K | 5 | 6 |