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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 |
| 1.8K |
| 7 |
| 7 |
| AS139358JP | KANSUIUN-AS-AP - Kansuiun Co., Ltd | 1.8K | 273 | 10 |
| AS38643JP | U-Cloud - UNIADEX, LTD. | 1.8K | — | 3 |
| AS24262JP | HIcom - HAMANASU INFORMATION Co., Ltd. | 2K | 65.5K | 2 |
| AS63774JP | KAMOIKE-NET - Kamoike.net LLP | 2K | 65.5K | 12 |
| AS136506JP | LEONCOLTD-AS-AP - LEON CO.LTD | 2K | — | 8 |
| AS131986JP | BB4U-NET - ITOCHU Cable Systems Corp. | 2K | 65.5K | 4 |
| AS24250JP | MC-IDC - Miyagin Digital Solutions Co.,Ltd. | 2K | — | 1 |
| AS59095JP | ACCELIA-W - ACCELIA | 2K | — | 1 |
| AS59122JP | R-SYS - Ranger-Systems Co., Ltd. | 2K | — | 2 |
| AS131901JP | fidessa-kk - FIDESSA KK | 2K | — | 3 |
| AS37912JP | IPRIO-JP - IPRIO Corporation. | 2K | 65.5K | 2 |
| AS131939JP | IPSISM-NET - IPS INC | 2K | — | 5 |
| AS131987JP | MCDR-NRT - MC Digital Realty, Inc. | 2K | 65.5K | 3 |
| AS24290JP | HEARTNET - Heart Network Co.,LTD | 2K | — | 1 |
| AS58784JP | RIS - Rissho University | 2K | — | 1 |
| AS23826JP | DAIDO-IT - Daido University | 2K | — | 3 |
| AS133458JP | FSCJCL-AS-AP - FPT Smart Cloud Japan Co., Ltd | 2K | 257 | 8 |
| AS152858JP | TWC-NET - Woven by Toyota, Inc. | 2K | 131.1K | 6 |
| AS131907JP | IWAMI-NET - Iwami Cablevision Co.,Ltd. | 2K | — | 4 |
| AS55383JP | IDC-JP - YYY Group, Inc. | 2K | — | 8 |
| AS23633JP | LOCAL-IX - Niigata Communication Service | 2K | — | 1 |
| AS38642JP | YOSHIZOU - Yoshizou XYZ Solutions | 2K | — | 1 |
| AS37915JP | Ke-net - Wakayama Prefectural Government | 2K | — | 1 |
| AS131969JP | SSC-2 - Suzuyo Shinwart Corporation | 2K | 258 | 6 |
| AS131961JP | DOKKYO-AS - Dokkyo University | 2K | — | 3 |
| AS131944JP | KADOKAWA-NET - KADOKAWA DWANGO CORPORATION | 2K | — | 8 |
| AS24512JP | HAL-Internet - HAL Internet, Internet Service Provider, Tottori, Japan | 2K | — | 1 |
| AS131971JP | AS131971-67 - JPNIC-4Byte-ASBLOCK-AP | 2K | 65.5K | 12 |
| AS18091JP | TEIKYO-U - Teikyo University | 2K | — | 3 |
| AS18076JP | WCE-IAMAS - Institute of Advanced Media Arts and Sciences | 2K | — | 1 |
| AS63793JP | OPSBETTER - Japan OPS Better Co., Ltd. | 2.3K | 65.5K | 9 |
| AS23818JP | JETINTERNET - JETINTERNET Corporation | 2.3K | — | 6 |
| AS24253JP | J-Stream - J-Stream Inc. | 2.3K | 65.5K | 3 |
| AS24229JP | KOCHI-IX - IX-layers, Inc. | 2.3K | 65.5K | 5 |
| AS59105JP | HOMENOC - Home NOC Operators Group | 2.6K | 65.5K | 6 |
| AS7530JP | BBTower-Lab - BroadBand Tower, Inc. | 2.6K | 65.5K | 4 |
| AS131955JP | KCNET - Kyoutou Cable Net Co Ltd | 2.6K | — | 3 |
| AS131941JP | ENTSU-NET - Entsu Co.,Ltd. | 2.6K | — | 6 |
| AS59103JP | SOFTETHER - SoftEther Corporation | 2.6K | 21K | 17 |
| AS58789JP | DUNAMIS - DUNAMIS Co.,Ltd | 2.6K | — | 10 |
| AS23632JP | TVT-NET - TVT Tsuyama Co.,Ltd. | 2.6K | — | 2 |
| AS55898JP | YAHOO-CORP - LY Corporation | 2.6K | 65.5K | 6 |
| AS63779JP | JUSTPLAYER - InfiniCloud Co. Ltd. | 2.6K | — | 2 |
| AS131957JP | MicroAd - MicroAd, Inc. | 2.8K | 65.5K | 6 |
| AS24286JP | WNI-AS - Weathernews,Inc. | 2.8K | — | 4 |
| AS7663JP | FFNET - FUJI NEXTERA LABO INC. | 2.8K | — | 11 |