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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 |
|---|---|---|---|---|
| AS7505JP | MEDIAWEB - Fujitsu Systems Applications & Support Limited | 21.5K | 65.5K | 5 |
| AS17958JP | KCV - Kasaoka Cable Vision Co,LTD. | 21.5K | 65.5K | 8 |
| AS24259JP | BC9 - kanuma cable television Corporation | 21.5K | 65.5K | 15 |
| AS132827JP | GATEWAY-AS-AP - GATEWAY INC | 21.2K | — | 46 |
| AS18267JP | DOSHISHA - Doshisha University | 20.5K | 1 | 3 |
| AS17931JP | NETFOREST - Netforest,Inc. | 20.5K | 65.5K | 10 |
| AS10012JP | FUSION - Rakuten Mobile, Inc. | 20.5K | 65.5K | 5 |
| AS18281JP | TAC-NET - Tokoname New-TV Corporation | 20.5K | 256 | 6 |
| AS24278JP | USEN-NET - USEN CORPORATION | 20.5K | 65.5K | 3 |
| AS2512JP | TCP-NET - TCP Inc. | 20.5K | — | 15 |
| AS9999JP | ATTOKYO - AT TOKYO Corporation | 20.2K | 65.5K | 11 |
| AS23784JP | POLEXCHENGE - SQUARE ENIX CO., LTD. | 20.2K | — | 10 |
| AS18097JP | DCN - D.C.N. Corporation | 20K | 65.5K | 20 |
| AS17516JP | NTTCOMWARE - NTT COMWARE CORPORATION | 19.5K | 32.8K | 24 |
| AS17957JP | CTS - SOUTH TOKYO CABLETELEVISION | 19.5K | — | 6 |
| AS151386JP | NCJ-NET - NHN Cloud Japan Corporation | 18.7K | — | 73 |
| AS17936JP | CTK - Cable Television Kani Co.,Inc. | 18.4K | 65.5K | 6 |
| AS23627JP | UCVNET - UEDA CABLE VISION CO.,LTD. | 18.4K | 65.5K | 8 |
| AS23790JP | KCN-TV - JCOM Co., Ltd. | 18.4K | — | 2 |
| AS10011JP | ADVAN - advanscope inc. | 18.4K | 65.5K | 8 |
| AS23831JP | CLOVERNET - NISIOWARI CATV CORPORATION | 18.4K | 65.5K | 8 |
| AS131911JP | HCTV-NET - HONJYO CABLE VISION CO., LTD. | 18.4K | 131.1K | 12 |
| AS24277JP | NIRAI - Okinawa Cable Network Inc. | 18.4K | 65.5K | 5 |
| AS131952JP | POTATO-NET - Asahikawa Cable Television Co., Ltd. | 17.9K | — | 5 |
| AS7503JP | AIR - Air Internet Service Co.,Ltd. | 17.4K | 65.5K | 5 |
| AS17683JP | WINTECH-COM - Wingtechnology Communications, Inc. | 17.4K | 65.5K | 5 |
| AS152875JP | MEEQ - MEEQ Inc. | 16.9K | — | 5 |
| AS9618JP | TCN - catv-tokushima | 16.4K | 65.5K | 3 |
| AS23635JP | CRCC - CRCCMedia Co.,ltd | 16.4K | — | 2 |
| AS37922JP | CATVY - Diversitymedia Co.,Ltd. | 16.4K | 65.5K | 7 |
| AS23805JP | WATVnet - Watarase Television Co.,Ltd | 16.4K | 65.5K | 6 |
| AS55910JP | SITNET-AS - Shibaura Institute of Technology | 16.4K | 1 | 2 |
| AS23619JP | E-OSAKA - SMARTVALUE Co.,Ltd. | 16.4K | — | 6 |
| AS17694JP | JPN-DBJP - Deutsche Bank Group, Japan BGP connection | 16.4K | — | 3 |
| AS55384JP | JAIST-EXP - Japan Advanced Institute of Science and Technology | 16.4K | 1 | 2 |
| AS23780JP | CTB - CTB Media Inc. | 16.4K | 65.5K | 6 |
| AS23620JP | DMM - DMM.com LLC | 15.4K | 1 | 7 |
| AS23822JP | HAGINET - HAGI Television Co., Ltd. | 15.1K | — | 30 |
| AS55899JP | IROB - irob Ltd. | 14.8K | 131.1K | 8 |
| AS24279JP | CAT-V - SENDAI CATV CO.,LTD. | 14.3K | 65.5K | 8 |
| AS9604JP | FSI-AS - FUJI SOFT INCORPORATED | 14.3K | — | 3 |
| AS23808JP | TOSHIMA-NET - TOSHIMA CABLE NETWORK CO.,LTD | 14.3K | — | 4 |
| AS131931JP | ACTV-NET - Aomori Cable TV Co., Ltd. | 13.8K | — | 6 |
| AS63997JP | TSUKAERUNET - Tsukaeru.net, Web Hosting Company, Japan | 13.6K | 65.5K | 9 |
| AS24295JP | AS-PNAPOSK - PacketFabric (Japan) Co., Ltd. | 13.6K | 65.5K | 9 |
| AS38639JP | HANABI - NTT DOCOMO BUSINESS, Inc. | 13.6K | 65.5K | 7 |
| AS18070JP | NDAC - Global Network Core Co.,Ltd. | 13.3K | 65.5K | 6 |
| AS23775JP | Tamatele-NET - Tamashima TV Inc. | 13.3K | 65.5K | 6 |
| AS17505JP | SBmobile - SoftBank Corp. | 12.8K | — | 20 |
| AS23639JP | ntt-bizlink - NTT Bizlink, Inc. | 12.8K | 65.5K | 14 |