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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.
1,300 autonomous systems registered to Japan. Click an AS for detail.
| 668 |
| AS17506JP | UCOM - ARTERIA Networks Corporation | 5.5M | 41 |
| AS2497JP | IIJ - Internet Initiative Japan Inc. | 4M | 236 |
| 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 |
| 65.5K |
| 6 |
| AS59105JP | HOMENOC - Home NOC Operators Group | 2.6K | 65.5K | 6 |
| AS63779JP | JUSTPLAYER - InfiniCloud Co. Ltd. | 2.6K | — | 2 |
| AS59103JP | SOFTETHER - SoftEther Corporation | 2.6K | 21K | 17 |
| AS24253JP | J-Stream - J-Stream Inc. | 2.3K | 65.5K | 3 |
| AS23818JP | JETINTERNET - JETINTERNET Corporation | 2.3K | — | 6 |
| AS23826JP | DAIDO-IT - Daido University | 2K | — | 3 |
| AS131969JP | SSC-2 - Suzuyo Shinwart Corporation | 2K | 258 | 6 |
| AS131939JP | IPSISM-NET - IPS INC | 2K | — | 5 |
| AS55383JP | IDC-JP - YYY Group, Inc. | 2K | — | 8 |
| AS18076JP | WCE-IAMAS - Institute of Advanced Media Arts and Sciences | 2K | — | 1 |
| AS131904JP | CYBERFEELINC-JP - Cyber Feel Inc. | 2K | — | 7 |
| AS136506JP | LEONCOLTD-AS-AP - LEON CO.LTD | 2K | — | 8 |
| AS141757JP | ZJC-AS-AP - Zoho Japan Corporation | 2K | 2 | 8 |
| AS131986JP | BB4U-NET - ITOCHU Cable Systems Corp. | 2K | 65.5K | 4 |
| AS131971JP | AS131971-67 - JPNIC-4Byte-ASBLOCK-AP | 2K | 65.5K | 12 |
| AS37915JP | Ke-net - Wakayama Prefectural Government | 2K | — | 1 |
| AS131987JP | MCDR-NRT - MC Digital Realty, Inc. | 2K | 65.5K | 3 |
| AS24512JP | HAL-Internet - HAL Internet, Internet Service Provider, Tottori, Japan | 2K | — | 1 |
| AS63774JP | KAMOIKE-NET - Kamoike.net LLP | 2K | 65.5K | 12 |
| AS152858JP | TWC-NET - Woven by Toyota, Inc. | 2K | 131.1K | 6 |
| AS59095JP | ACCELIA-W - ACCELIA | 2K | — | 1 |
| AS37912JP | IPRIO-JP - IPRIO Corporation. | 2K | 65.5K | 2 |
| AS24290JP | HEARTNET - Heart Network Co.,LTD | 2K | — | 1 |
| AS58784JP | RIS - Rissho University | 2K | — | 1 |
| AS133458JP | FSCJCL-AS-AP - FPT Smart Cloud Japan Co., Ltd | 2K | 257 | 8 |
| AS131901JP | fidessa-kk - FIDESSA KK | 2K | — | 3 |
| AS24250JP | MC-IDC - Miyagin Digital Solutions Co.,Ltd. | 2K | — | 1 |
| AS131961JP | DOKKYO-AS - Dokkyo University | 2K | — | 3 |
| AS18091JP | TEIKYO-U - Teikyo University | 2K | — | 3 |
| AS38642JP | YOSHIZOU - Yoshizou XYZ Solutions | 2K | — | 1 |
| AS131944JP | KADOKAWA-NET - KADOKAWA DWANGO CORPORATION | 2K | — | 8 |
| AS59122JP | R-SYS - Ranger-Systems Co., Ltd. | 2K | — | 2 |
| AS24262JP | HIcom - HAMANASU INFORMATION Co., Ltd. | 2K | 65.5K | 2 |
| AS23633JP | LOCAL-IX - Niigata Communication Service | 2K | — | 1 |
| AS131907JP | IWAMI-NET - Iwami Cablevision Co.,Ltd. | 2K | — | 4 |
| AS4774JP | ABONE-AS - A-Bone by Internet Initiative Japan Inc. | 1.8K | — | 4 |
| AS152868JP | THX-NET - THX Corp. | 1.8K | — | 6 |
| AS139345JP | HYVEMANAGEDHOSTINGCORPINC-AS-AP - Hyve Managed Hosting Corp Inc | 1.8K | 7 | 8 |
| AS131914JP | DD-NET - Rakuten Group, Inc. | 1.8K | — | 5 |
| AS37889JP | JPARC-NET - J-PARC Center | 1.8K | — | 3 |
| AS38643JP | U-Cloud - UNIADEX, LTD. | 1.8K | — | 3 |
| AS55888JP | Nintatsu - Nintatsu Global Telecommunications Corporation | 1.7K | — | 6 |
| AS63789JP | NEXT-WEB - NeXtWEB Corporation | 1.5K | — | 3 |
| AS24280JP | HIS-TKIDC - Hitachi Systems, Ltd. | 1.5K | — | 2 |
| AS18123JP | SEIRYO - INAOKI EDUCATIONAL INSTITUTION | 1.5K | 1 | 3 |
| AS7527JP | JPIX - Japan Internet Xing Co., Ltd. | 1.5K | 65.5K | 3 |