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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 |
| 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 |