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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 |
| 256 |
| 1 |
| 2 |
| AS141694JP | ERMISLTD-AS-AP - Ermis Ltd. | 256 | — | 1 |
| AS38649JP | UEC-EXP - The University of Electro-Communications | 256 | — | 1 |
| AS58649JP | GMO-REG-R1 - GMO Internet, Inc. | 256 | 1 | 2 |
| AS152867JP | TCNET - Takaoka cable network | 256 | 4.1K | 2 |
| AS131156JP | LAC-AS - LAC Co., Ltd. | 256 | 1 | 2 |
| AS38644JP | KANDANET - INTERNET MULTIFEED CO. | 256 | 1 | 2 |
| AS59111JP | AIU-NET - Akita International University | 256 | 1 | 2 |
| AS55890JP | SUNTORY - Suntory Business Systems Ltd. | 256 | — | 1 |
| AS63797JP | CUTEIP - CuteIP | 512 | 65.5K | 4 |
| AS945JP | JP-77-20220621 HAONAN YANG | 512 | — | 2 |
| AS152865JP | LC-NET - Tokyo University of Technology Linux Club | 512 | 4 | 2 |
| AS139255JP | U-NEXT-AS-AP - U-NEXT Co.,Ltd. | 512 | — | 2 |
| AS4777JP | APNIC-COLO - Asia Pacific Network Information Centre | 512 | 16.4K | 4 |
| AS17941JP | BIT-ISLE - Equinix Japan Enterprise K.K. | 512 | — | 2 |
| AS63794JP | ILKS-NET - ILKS Inc. | 512 | 65.5K | 2 |
| AS7257JP | MARU-NET OTO GK | 512 | 524.3K | 3 |
| AS38636JP | DENA-NET - DeNA, Co. Ltd. | 512 | 3 | 5 |
| AS24260JP | KINJO-AS - Board of trusty: Kinjo-Gakuen | 512 | — | 1 |
| AS59098JP | Hinaturu-Net - Mamireimu Net Work's | 512 | 4.1K | 3 |
| AS150366JP | Demae-can-NW - demae-can co. ltd | 512 | — | 2 |
| AS152876JP | COMOTA - Comota Co., Ltd. | 512 | 65.5K | 2 |
| AS146985JP | KC-MSP-NET - KISSEI COMTEC Co.,Ltd | 512 | — | 1 |
| AS38656JP | Loutres - Loutres | 512 | 1 | 3 |
| AS151390JP | RUTILEA-A - RUTILEA, Inc. | 512 | — | 1 |
| AS152872JP | VL-NET - VirtualLink Networks | 512 | — | 2 |
| AS138352JP | Fractal-NET - Fractal Co., Ltd. | 512 | — | 2 |
| AS133782JP | ELSEVIER-ASIAPACIFIC-AS-AP - Elsevier Ltd | 512 | — | 2 |
| AS215871JP | XTOM-JP xTom Japan Corporation | 512 | 524.8K | 5 |
| AS151383JP | EZSVS-NET - EZSVS Japan Co., Ltd. | 512 | — | 1 |
| AS63806JP | MENHERA - Human-life Information Platforms Institute | 512 | 514 | 6 |
| AS141461JP | RA-NET - Reconciled Awareness Network | 512 | — | 1 |
| AS152873JP | NEODY-NET - Neodyland | 512 | 65.5K | 4 |
| AS58790JP | TeamFelNull - SERVER-G Group | 512 | 11 | 7 |
| AS59120JP | TINS-NET - Tsukuba Internet Service Corporation | 512 | — | 1 |
| AS131983JP | SCNTV-NET - suo cablenet corporation | 512 | — | 1 |
| AS63785JP | FU-NTP - Fukuoka University | 512 | 3 | 5 |
| AS151371JP | PAINA - PAINA Information Development | 512 | 65.5K | 2 |
| AS131902JP | LOGICLINKS2 - LogicLinks, Inc. | 512 | — | 2 |
| AS131977JP | JPF-WEB - Japan Photo Finish Corporation | 512 | — | 1 |
| AS150356JP | GMO-BRS - GMO BRAND SECURITY Inc. | 512 | — | 1 |
| AS55396JP | FNCLAB - NRI SecureTechnologies, Ltd | 512 | — | 2 |
| AS146974JP | WP-NET - Woven by Toyota, Inc. | 512 | 65.5K | 2 |
| AS137819JP | BEEKS-AS-AP - Beeks Financial Cloud (Japan) | 512 | — | 2 |
| AS63791JP | DOORNOC-NET - doornoc | 512 | 65.5K | 2 |
| AS136178JP | FILAPAC-AS-JP - FIL Japan Holdings K.K. | 512 | — | 2 |
| AS136779JP | SCHNEIDER-AS-JP - Schneider Electric Japan Ltd | 512 | — | 1 |