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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.
| AS | Holder | IPv4 | Prefixes |
|---|---|---|---|
| AS17676JP | GIGAINFRA - SoftBank Corp. | 49.7M | 490 |
| AS4713JP | OCN - NTT DOCOMO BUSINESS,Inc. | 28.6M | 189 |
| AS2516JP | KDDI - KDDI CORPORATION | 18.2M | 578 |
| AS9824JP | JTCL-JP-AS - JCOM Co., Ltd. | 10.4M | 297 |
| AS2907JP | SINET-AS - Research Organization of Information and Systems, National Institute of Informatics | 9M | 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 |
Share of announced address space covered by valid Route Origin Authorizations.
1,303 autonomous systems registered to Japan. Click an AS for detail.
| AS | Holder | IPv4 ↓ | IPv6 /48 | Prefixes |
|---|---|---|---|---|
| AS59093JP | ICKNET - IMABARI CATV CORPORATION | 3.1K | 1 | 3 |
| AS23828JP | CHERRY-NET - Misaki Town | 3.1K | — | 2 |
| AS59129JP | LOGICLINKS - LogicLinks, Inc. | 2.8K | — | 9 |
| AS24286JP | WNI-AS - Weathernews,Inc. | 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 |