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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 |
| 512 |
| — |
| 1 |
| AS38636JP | DENA-NET - DeNA, Co. Ltd. | 512 | 3 | 5 |
| AS150356JP | GMO-BRS - GMO BRAND SECURITY Inc. | 512 | — | 1 |
| AS139255JP | U-NEXT-AS-AP - U-NEXT Co.,Ltd. | 512 | — | 2 |
| AS131977JP | JPF-WEB - Japan Photo Finish Corporation | 512 | — | 1 |
| AS63785JP | FU-NTP - Fukuoka University | 512 | 3 | 5 |
| AS63804JP | DOVA-YFM-NET - DOVA Corporation | 512 | — | 1 |
| AS133782JP | ELSEVIER-ASIAPACIFIC-AS-AP - Elsevier Ltd | 512 | — | 2 |
| AS151385JP | JAPANET-H - Japanet Holdings Co.,Ltd. | 512 | — | 1 |
| AS63797JP | CUTEIP - CuteIP | 512 | 65.5K | 4 |
| AS152872JP | VL-NET - VirtualLink Networks | 512 | — | 2 |
| AS152865JP | LC-NET - Tokyo University of Technology Linux Club | 512 | 4 | 2 |
| AS151350JP | NIPPONCOMMSINC-AS-AP - NIPPON COMMUNICATIONS INC. | 512 | — | 1 |
| AS55396JP | FNCLAB - NRI SecureTechnologies, Ltd | 512 | — | 2 |
| AS132504JP | QUALITIA-AS-AP - QUALITIA Co.,Ltd | 512 | — | 1 |
| AS138321JP | Lunasla - Lunasla Inc. | 512 | 65.5K | 2 |
| AS152873JP | NEODY-NET - Neodyland | 512 | 65.5K | 3 |
| AS151383JP | EZSVS-NET - EZSVS Japan Co., Ltd. | 512 | — | 1 |
| AS131902JP | LOGICLINKS2 - LogicLinks, Inc. | 512 | — | 2 |
| AS142052JP | MEMPOOLSPACEKK-AS-AP - Mempool Space K.K. | 512 | 2 | 4 |
| AS4717JP | AI3 - WIDE Project | 512 | 81.9K | 4 |
| AS152877JP | NIN - Nintendo Co., Ltd | 512 | 2 | 4 |
| AS146985JP | KC-MSP-NET - KISSEI COMTEC Co.,Ltd | 512 | — | 1 |
| AS147035JP | CHINGKUO-AS-AP - Ching Kuo | 512 | 1 | 2 |
| AS136178JP | FILAPAC-AS-JP - FIL Japan Holdings K.K. | 512 | — | 2 |
| AS131983JP | SCNTV-NET - suo cablenet corporation | 512 | — | 1 |
| AS38656JP | Loutres - Loutres | 512 | 1 | 3 |
| AS146980JP | IOC - Tokyo Metropolitan College of Industrial Technology Infomation System Engineering Course | 256 | 1 | 2 |
| AS131924JP | KAP-NET - Kansai Airports | 256 | 1 | 2 |
| AS23774JP | A-DNS-JP - Japan Registry Service Co., Ltd. | 256 | 65.5K | 2 |
| AS131903JP | NRI-IVPN - Nomura Research Institute,Ltd. | 256 | — | 1 |
| AS131156JP | LAC-AS - LAC Co., Ltd. | 256 | 1 | 2 |
| AS133180JP | STARBOWLTD-AS-AP - Starbow Ltd. | 256 | — | 1 |
| AS63780JP | BIRDIE-NET - dual&Co. Inc. | 256 | 16.4K | 2 |
| AS55890JP | SUNTORY - Suntory Business Systems Ltd. | 256 | — | 1 |
| AS62184JP | MNO-AS Michal Nowak | 256 | 1 | 2 |
| AS150368JP | TESTBED-KLN - SERVER-G Group | 256 | 3 | 4 |
| AS23634JP | E-DNS-JP - WIDE Project | 256 | 8.2K | 2 |
| AS131894JP | U-Cloud-2 - UNIADEX, LTD. | 256 | — | 1 |
| AS214675JP | Starlamp Hidenori Matsuo | 256 | 4.7K | 18 |
| AS146986JP | SSC-3 - SUZUYO SHINWART CORPORATION | 256 | 256 | 2 |
| AS152184JP | TAMUKAINET-AS-AP - Tamukai Network | 256 | 264 | 10 |
| AS63795JP | ROUTEL - RoutelNet | 256 | 4.1K | 2 |
| AS134827JP | EYJAPAN-AS-AP - EY Japan Co., Ltd. | 256 | — | 1 |
| AS135372JP | CSJI-AS-AP - Columbia Sportswear Japan Inc | 256 | — | 1 |
| AS45678JP | AAC-JP-AS - ABN AMRO Clearing Tokyo Co., Ltd. | 256 | — | 1 |
| AS152869JP | ICJ-NET - ICJ, Inc. | 256 | — | 1 |