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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.
1,303 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. | 4.2M | 269 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
| 2.8K |
| — |
| 4 |
| AS131957JP | MicroAd - MicroAd, Inc. | 2.8K | 65.5K | 6 |
| AS7663JP | FFNET - FUJI NEXTERA LABO INC. | 2.8K | — | 11 |
| AS58648JP | AT-I-NET - AT-I, Inc. | 2.8K | — | 7 |
| AS55898JP | YAHOO-CORP - LY Corporation | 2.6K | 65.5K | 6 |
| AS7530JP | BBTower-Lab - BroadBand Tower, Inc. | 2.6K | 65.5K | 4 |
| AS59103JP | SOFTETHER - SoftEther Corporation | 2.6K | 21K | 17 |
| AS151378JP | CSAISON-NET - Credit SAISON Co., Ltd. | 2.6K | — | 3 |
| AS59105JP | HOMENOC - Home NOC Operators Group | 2.6K | 65.5K | 6 |
| AS131941JP | ENTSU-NET - Entsu Co.,Ltd. | 2.6K | — | 6 |
| AS58789JP | DUNAMIS - DUNAMIS Co.,Ltd | 2.6K | — | 10 |
| AS23632JP | TVT-NET - TVT Tsuyama Co.,Ltd. | 2.6K | — | 2 |
| AS63779JP | JUSTPLAYER - InfiniCloud Co. Ltd. | 2.6K | — | 2 |
| 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 |
| AS141757JP | ZJC-AS-AP - Zoho Japan Corporation | 2.3K | 2 | 9 |
| AS131907JP | IWAMI-NET - Iwami Cablevision Co.,Ltd. | 2K | — | 4 |
| AS24512JP | HAL-Internet - HAL Internet, Internet Service Provider, Tottori, Japan | 2K | — | 1 |
| AS131939JP | IPSISM-NET - IPS INC | 2K | — | 5 |
| AS133458JP | FSCJCL-AS-AP - FPT Smart Cloud Japan Co., Ltd | 2K | 257 | 8 |
| AS18076JP | WCE-IAMAS - Institute of Advanced Media Arts and Sciences | 2K | — | 1 |
| AS131969JP | SSC-2 - Suzuyo Shinwart Corporation | 2K | 258 | 6 |
| AS59095JP | ACCELIA-W - ACCELIA | 2K | — | 1 |
| AS24250JP | MC-IDC - Miyagin Digital Solutions Co.,Ltd. | 2K | — | 1 |
| AS59122JP | R-SYS - Ranger-Systems Co., Ltd. | 2K | — | 2 |
| AS37915JP | Ke-net - Wakayama Prefectural Government | 2K | — | 1 |
| AS131971JP | AS131971-67 - JPNIC-4Byte-ASBLOCK-AP | 2K | 65.5K | 12 |
| AS38642JP | YOSHIZOU - Yoshizou XYZ Solutions | 2K | — | 1 |
| AS24262JP | HIcom - HAMANASU INFORMATION Co., Ltd. | 2K | 65.5K | 2 |
| AS131987JP | MCDR-NRT - MC Digital Realty, Inc. | 2K | 65.5K | 3 |
| AS131986JP | BB4U-NET - ITOCHU Cable Systems Corp. | 2K | 65.5K | 4 |
| AS63774JP | KAMOIKE-NET - Kamoike.net LLP | 2K | 65.5K | 12 |
| AS131904JP | CYBERFEELINC-JP - Cyber Feel Inc. | 2K | — | 7 |
| AS23826JP | DAIDO-IT - Daido University | 2K | — | 3 |
| AS37912JP | IPRIO-JP - IPRIO Corporation. | 2K | 65.5K | 2 |
| AS131944JP | KADOKAWA-NET - KADOKAWA DWANGO CORPORATION | 2K | — | 8 |
| AS136506JP | LEONCOLTD-AS-AP - LEON CO.LTD | 2K | — | 8 |
| AS152858JP | TWC-NET - Woven by Toyota, Inc. | 2K | 131.1K | 6 |
| AS24290JP | HEARTNET - Heart Network Co.,LTD | 2K | — | 1 |
| AS131901JP | fidessa-kk - FIDESSA KK | 2K | — | 3 |
| AS55383JP | IDC-JP - YYY Group, Inc. | 2K | — | 8 |
| AS131961JP | DOKKYO-AS - Dokkyo University | 2K | — | 3 |
| AS23633JP | LOCAL-IX - Niigata Communication Service | 2K | — | 1 |
| AS18091JP | TEIKYO-U - Teikyo University | 2K | — | 3 |
| AS131899JP | DIG-NET - DIG Inc. | 2K | — | 8 |
| AS58784JP | RIS - Rissho University | 2K | — | 1 |