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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 |
| — |
| — |
| 0 |
| AS37923JP | FIC - NTT DOCOMO BUSINESS, Inc. | — | — | 0 |
| AS56218JP | QGPOP-AS-AP - QGPOP | — | 65.5K | 1 |
| AS4698JP | INTERLINK - InterLink Co., Ltd. | — | — | 0 |
| AS2517JP | AS2517-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131978JP | NTTCOM-VoIP - NTT DOCOMO BUSINESS,Inc. | — | — | 0 |
| AS131157JP | MAGMA-IPV6 - IMS Corporation | — | — | 0 |
| AS4702JP | AS4702-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7669JP | AS7669-10 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS218871JP | NISHIO-AS Kazuto Nishio | — | 16 | 1 |
| AS215239JP | SHOW Show Corporation | — | 512 | 2 |
| AS152860JP | GJW-KK - GANJINGWORLD K.K. | — | 1 | 1 |
| AS4717JP | AI3 - WIDE Project | — | 81.9K | 2 |
| AS10020JP | AS10020-31 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9598JP | MPLS-OCN - NTT DOCOMO BUSINESS,Inc. | — | — | 0 |
| AS17700JP | AS17700-28 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18147JP | AS18147-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4674JP | AS4674-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS63808JP | AS63808-39 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS2503JP | AS2503-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151069JP | AS-VMW-MEL - VMWare Incorporation | — | — | 0 |
| AS63809JP | AS63809-40 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4700JP | NIJI-NET - Niji-Net Inc. | — | — | 0 |
| AS151031JP | TAO_AUCKLAND - AT&T TAO Cloud Access Node | — | — | 0 |
| AS131990JP | AS131990-86 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS37984JP | CKADMIN-AS-JP - Chikushi Jogakuen University, Non-transit AS. | — | — | 0 |
| AS55896JP | VIDEX - Videx Inc. | — | — | 0 |
| AS23800JP | AS23800-28 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23625JP | TOKAI-WBS - TOKAI Communications Corporation | — | — | 0 |
| AS9603JP | AS9603-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9594JP | AS9594-4 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7603JP | GENECOMPUTINGLTD-AS-AP - Gene Computing Ltd | — | — | 0 |
| AS146978JP | BBIX-Fukuoka - BBIX, Inc. | — | — | 0 |
| AS2499JP | ipv4exh-lab - Japan Network Information Center | — | — | 0 |
| AS401655JP | TRANSVISIONNET - TransVision LLC | — | — | 0 |
| AS151074JP | AS-VMW-TPE - VMWare Incorporation | — | — | 0 |
| AS150362JP | Kuriyama-Net - Mamireimu Net Work's | — | — | 0 |
| AS18280JP | AS18280-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131947JP | NOS-SERVICE - Net One Systems Co., Ltd. | — | — | 0 |
| AS18089JP | HIKARI-NWC - KDDI Corporation | — | — | 0 |
| AS17949JP | TEU - Tokyo University of Technorogy | — | — | 0 |
| AS17684JP | AS17684-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9380JP | CNCI-AS - Community Network Center Inc. | — | — | 0 |
| AS9375JP | AS9375-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9359JP | AS9359-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9743JP | NIPPONEDUIX-AS-AP - Nippon EDUIX | — | 1 | 1 |
| AS38646JP | BENKYO-NET - Neodyland | — | 1 | 1 |