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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.
1,300 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. | 4M | 236 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
| 512 |
| — |
| 2 |
| AS152872JP | VL-NET - VirtualLink Networks | 512 | — | 2 |
| AS138321JP | Lunasla - Lunasla Inc. | 512 | 65.5K | 2 |
| AS142052JP | MEMPOOLSPACEKK-AS-AP - Mempool Space K.K. | 512 | 2 | 4 |
| AS63785JP | FU-NTP - Fukuoka University | 512 | 3 | 5 |
| AS24260JP | KINJO-AS - Board of trusty: Kinjo-Gakuen | 512 | — | 1 |
| AS55909JP | kochi-ct - National Institute of Technology, Kochi College | 512 | 1 | 4 |
| AS150356JP | GMO-BRS - GMO BRAND SECURITY Inc. | 512 | — | 1 |
| AS7257JP | MARU-NET OTO GK | 512 | 524.3K | 3 |
| AS131988JP | TANET - Takehara Cable Network Co,Ltd | 512 | 65.5K | 2 |
| AS152877JP | NIN - Nintendo Co., Ltd | 512 | 2 | 4 |
| AS151350JP | NIPPONCOMMSINC-AS-AP - NIPPON COMMUNICATIONS INC. | 512 | — | 1 |
| AS141461JP | RA-NET - Reconciled Awareness Network | 512 | — | 1 |
| AS38656JP | Loutres - Loutres | 512 | 1 | 3 |
| AS147035JP | CHINGKUO-AS-AP - Ching Kuo | 512 | 1 | 2 |
| AS63806JP | MENHERA - Human-life Information Platforms Institute | 512 | 514 | 6 |
| AS152865JP | LC-NET - Tokyo University of Technology Linux Club | 512 | 4 | 2 |
| AS151385JP | JAPANET-H - Japanet Holdings Co.,Ltd. | 512 | — | 1 |
| AS146974JP | WP-NET - Woven by Toyota, Inc. | 512 | 65.5K | 2 |
| AS59098JP | Hinaturu-Net - Mamireimu Net Work's | 512 | 4.1K | 3 |
| AS4717JP | AI3 - WIDE Project | 512 | 81.9K | 4 |
| AS63797JP | CUTEIP - CuteIP | 512 | 65.5K | 4 |
| AS63794JP | ILKS-NET - ILKS Inc. | 512 | 65.5K | 2 |
| AS945JP | JP-77-20220621 HAONAN YANG | 512 | — | 2 |
| AS212259JP | ASTRIX-EU Astrix Co., Ltd. | 512 | 65.5K | 3 |
| AS151380JP | transformedu - Transform Co., Ltd. | 512 | — | 1 |
| AS133782JP | ELSEVIER-ASIAPACIFIC-AS-AP - Elsevier Ltd | 512 | — | 2 |
| AS137819JP | BEEKS-AS-AP - Beeks Financial Cloud (Japan) | 512 | — | 2 |
| AS63804JP | DOVA-YFM-NET - DOVA Corporation | 512 | — | 1 |
| AS132504JP | QUALITIA-AS-AP - QUALITIA Co.,Ltd | 512 | — | 1 |
| AS214675JP | Starlamp Hidenori Matsuo | 256 | 4.7K | 17 |
| AS152184JP | TAMUKAINET-AS-AP - Tamukai Network | 256 | 264 | 10 |
| AS131924JP | KAP-NET - Kansai Airports | 256 | 1 | 2 |
| AS55890JP | SUNTORY - Suntory Business Systems Ltd. | 256 | — | 1 |
| AS23634JP | E-DNS-JP - WIDE Project | 256 | 8.2K | 2 |
| AS133180JP | STARBOWLTD-AS-AP - Starbow Ltd. | 256 | — | 1 |
| AS63795JP | ROUTEL - RoutelNet | 256 | 4.1K | 2 |
| AS131951JP | SSC - Suzuyo Shinwart Corporation | 256 | 256 | 2 |
| AS131948JP | FORNEXT - FORNEXT Inc. | 256 | 1 | 2 |
| AS150368JP | TESTBED-KLN - SERVER-G Group | 256 | 3 | 4 |
| AS131156JP | LAC-AS - LAC Co., Ltd. | 256 | 1 | 2 |
| AS146986JP | SSC-3 - SUZUYO SHINWART CORPORATION | 256 | 256 | 2 |
| AS131903JP | NRI-IVPN - Nomura Research Institute,Ltd. | 256 | — | 1 |
| AS131894JP | U-Cloud-2 - UNIADEX, LTD. | 256 | — | 1 |
| AS135372JP | CSJI-AS-AP - Columbia Sportswear Japan Inc | 256 | — | 1 |
| AS134827JP | EYJAPAN-AS-AP - EY Japan Co., Ltd. | 256 | — | 1 |
| AS58790JP | TeamFelNull - SERVER-G Group | 256 | 11 | 6 |