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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 | 205 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 36 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 67 |
| 13.8K |
| 65.5K |
| 10 |
| AS131931JP | ACTV-NET - Aomori Cable TV Co., Ltd. | 13.8K | — | 6 |
| AS23822JP | HAGINET - HAGI Television Co., Ltd. | 14.1K | — | 27 |
| 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 |
| AS23620JP | DMM - DMM.com LLC | 15.4K | 1 | 7 |
| AS17694JP | JPN-DBJP - Deutsche Bank Group, Japan BGP connection | 16.4K | — | 3 |
| AS23619JP | E-OSAKA - SMARTVALUE Co.,Ltd. | 16.4K | — | 6 |
| AS37922JP | CATVY - Diversitymedia Co.,Ltd. | 16.4K | 65.5K | 7 |
| AS24279JP | CAT-V - SENDAI CATV CO.,LTD. | 16.4K | 65.5K | 9 |
| AS23635JP | CRCC - CRCCMedia Co.,ltd | 16.4K | — | 2 |
| AS55384JP | JAIST-EXP - Japan Advanced Institute of Science and Technology | 16.4K | 1 | 2 |
| AS55910JP | SITNET-AS - Shibaura Institute of Technology | 16.4K | 1 | 2 |
| AS23780JP | CTB - CTB Media Inc. | 16.4K | 65.5K | 6 |
| AS9618JP | TCN - catv-tokushima | 16.4K | 65.5K | 3 |
| 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 |
| AS10011JP | ADVAN - advanscope inc. | 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 |
| AS23790JP | KCN-TV - JCOM Co., Ltd. | 18.4K | — | 2 |
| AS23627JP | UCVNET - UEDA CABLE VISION CO.,LTD. | 18.4K | 65.5K | 8 |
| AS23831JP | CLOVERNET - NISIOWARI CATV CORPORATION | 18.4K | 65.5K | 8 |
| AS17936JP | CTK - Cable Television Kani Co.,Inc. | 18.4K | 65.5K | 6 |
| AS151386JP | NCJ-NET - NHN Cloud Japan Corporation | 18.7K | — | 73 |
| AS17957JP | CTS - SOUTH TOKYO CABLETELEVISION | 19.5K | — | 6 |
| AS17516JP | NTTCOMWARE - NTT COMWARE CORPORATION | 19.5K | 32.8K | 24 |
| 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 |
| AS10012JP | FUSION - Rakuten Mobile, Inc. | 20.5K | 65.5K | 5 |
| AS18267JP | DOSHISHA - Doshisha University | 20.5K | 1 | 3 |
| AS17931JP | NETFOREST - Netforest,Inc. | 20.5K | 65.5K | 10 |
| AS2512JP | TCP-NET - TCP Inc. | 20.5K | — | 15 |
| AS18281JP | TAC-NET - Tokoname New-TV Corporation | 20.5K | 256 | 6 |
| AS134351JP | LEASEWEB-AS-AP - Leaseweb Japan K.K. | 20.7K | 65.5K | 52 |
| AS24278JP | USEN-NET - USEN CORPORATION | 20.7K | 65.5K | 4 |
| AS24259JP | BC9 - kanuma cable television Corporation | 21.5K | 65.5K | 15 |
| AS17958JP | KCV - Kasaoka Cable Vision Co,LTD. | 21.5K | 65.5K | 8 |
| AS17691JP | TikiTiki - NDS Co., Ltd. | 21.5K | — | 7 |
| AS7505JP | MEDIAWEB - Fujitsu Systems Applications & Support Limited | 21.5K | 65.5K | 5 |
| AS132827JP | GATEWAY-AS-AP - GATEWAY INC | 21.8K | — | 48 |
| AS131925JP | CYBERHOME2 - FAMILY NET JAPAN INCORPORATED | 21.8K | 393.2K | 13 |