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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 |
| HANABI - NTT DOCOMO BUSINESS, Inc. |
| 13.6K |
| 65.5K |
| 7 |
| AS131931JP | ACTV-NET - Aomori Cable TV Co., Ltd. | 13.8K | — | 6 |
| AS23805JP | WATVnet - Watarase Television Co.,Ltd | 14.3K | 65.5K | 5 |
| AS23808JP | TOSHIMA-NET - TOSHIMA CABLE NETWORK CO.,LTD | 14.3K | — | 4 |
| AS9604JP | FSI-AS - FUJI SOFT INCORPORATED | 14.3K | — | 3 |
| AS55899JP | IROB - irob Ltd. | 14.8K | 131.1K | 8 |
| AS23822JP | HAGINET - HAGI Television Co., Ltd. | 15.1K | — | 30 |
| AS23620JP | DMM - DMM.com LLC | 15.4K | 1 | 7 |
| AS55384JP | JAIST-EXP - Japan Advanced Institute of Science and Technology | 16.4K | 1 | 2 |
| AS23780JP | CTB - CTB Media Inc. | 16.4K | 65.5K | 6 |
| AS17694JP | JPN-DBJP - Deutsche Bank Group, Japan BGP connection | 16.4K | — | 3 |
| AS37922JP | CATVY - Diversitymedia Co.,Ltd. | 16.4K | 65.5K | 7 |
| AS55910JP | SITNET-AS - Shibaura Institute of Technology | 16.4K | 1 | 2 |
| AS9618JP | TCN - catv-tokushima | 16.4K | 65.5K | 3 |
| AS24279JP | CAT-V - SENDAI CATV CO.,LTD. | 16.4K | 65.5K | 9 |
| AS23619JP | E-OSAKA - SMARTVALUE Co.,Ltd. | 16.4K | — | 6 |
| AS23635JP | CRCC - CRCCMedia Co.,ltd | 16.4K | — | 2 |
| AS152875JP | MEEQ - MEEQ Inc. | 16.9K | — | 5 |
| AS17683JP | WINTECH-COM - Wingtechnology Communications, Inc. | 17.4K | 65.5K | 5 |
| AS7503JP | AIR - Air Internet Service Co.,Ltd. | 17.4K | 65.5K | 5 |
| AS131952JP | POTATO-NET - Asahikawa Cable Television Co., Ltd. | 17.9K | — | 5 |
| AS131911JP | HCTV-NET - HONJYO CABLE VISION CO., LTD. | 18.4K | 131.1K | 12 |
| AS23790JP | KCN-TV - JCOM Co., Ltd. | 18.4K | — | 2 |
| AS10011JP | ADVAN - advanscope inc. | 18.4K | 65.5K | 8 |
| AS24277JP | NIRAI - Okinawa Cable Network Inc. | 18.4K | 65.5K | 5 |
| AS23831JP | CLOVERNET - NISIOWARI CATV CORPORATION | 18.4K | 65.5K | 8 |
| AS17936JP | CTK - Cable Television Kani Co.,Inc. | 18.4K | 65.5K | 6 |
| AS23627JP | UCVNET - UEDA CABLE VISION CO.,LTD. | 18.4K | 65.5K | 8 |
| AS151386JP | NCJ-NET - NHN Cloud Japan Corporation | 18.7K | — | 73 |
| AS17516JP | NTTCOMWARE - NTT COMWARE CORPORATION | 19.5K | 32.8K | 24 |
| AS17957JP | CTS - SOUTH TOKYO CABLETELEVISION | 19.5K | — | 6 |
| AS23784JP | POLEXCHENGE - SQUARE ENIX CO., LTD. | 19.7K | — | 9 |
| AS18097JP | DCN - D.C.N. Corporation | 20K | 65.5K | 20 |
| AS9999JP | ATTOKYO - AT TOKYO Corporation | 20.2K | 65.5K | 11 |
| AS2512JP | TCP-NET - TCP Inc. | 20.5K | — | 15 |
| AS10012JP | FUSION - Rakuten Mobile, Inc. | 20.5K | 65.5K | 5 |
| AS24278JP | USEN-NET - USEN CORPORATION | 20.5K | 65.5K | 3 |
| AS18281JP | TAC-NET - Tokoname New-TV Corporation | 20.5K | 256 | 6 |
| AS18267JP | DOSHISHA - Doshisha University | 20.5K | 1 | 3 |
| AS17931JP | NETFOREST - Netforest,Inc. | 20.5K | 65.5K | 10 |
| AS134351JP | LEASEWEB-AS-AP - Leaseweb Japan K.K. | 21K | 65.5K | 53 |
| AS24259JP | BC9 - kanuma cable television Corporation | 21.5K | 65.5K | 15 |
| AS17691JP | TikiTiki - NDS Co., Ltd. | 21.5K | — | 7 |
| AS132827JP | GATEWAY-AS-AP - GATEWAY INC | 21.5K | — | 47 |
| AS17958JP | KCV - Kasaoka Cable Vision Co,LTD. | 21.5K | 65.5K | 8 |
| AS7505JP | MEDIAWEB - Fujitsu Systems Applications & Support Limited | 21.5K | 65.5K | 5 |
| AS131925JP | CYBERHOME2 - FAMILY NET JAPAN INCORPORATED | 21.8K | 393.2K | 13 |