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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.
| AS | Holder | IPv4 | Prefixes |
|---|---|---|---|
| AS17676JP | GIGAINFRA - SoftBank Corp. | 49.7M | 490 |
| AS4713JP | OCN - NTT DOCOMO BUSINESS,Inc. | 28.6M | 189 |
| AS2516JP | KDDI - KDDI CORPORATION | 18.2M | 578 |
| AS9824JP | JTCL-JP-AS - JCOM Co., Ltd. | 10.4M | 297 |
| AS2907JP | SINET-AS - Research Organization of Information and Systems, National Institute of Informatics | 9M | 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 |
Share of announced address space covered by valid Route Origin Authorizations.
1,303 autonomous systems registered to Japan. Click an AS for detail.
| AS | Holder | IPv4 ↓ | IPv6 /48 | Prefixes |
|---|---|---|---|---|
| AS138038JP | WOLFLAB-AS-AP - Wolf Network Lab | — | 1 | 1 |
| AS218640JP | KC-AS Kansei CHIBA | — | 1 | 1 |
| AS4683JP | AS4683-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18269JP | KAI - Kai Creates Inc. | — | — | 0 |
| AS214699JP | ROSETTA-MNT LIU JIARONG | — | — | 0 |
| AS9606JP | ISAS-AS - Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency | — | — | 0 |
| AS140868JP | TAKATASDCC-AS-AP - TakataSDCC Net | — | 2 | 2 |
| AS17949JP | TEU - Tokyo University of Technorogy | — | — | 0 |
| AS4674JP | AS4674-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17527JP | MEDIAS - CHITA MEDIAS NETWORK 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 |
| AS55906JP | AS55906-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7603JP | GENECOMPUTINGLTD-AS-AP - Gene Computing Ltd | — | — | 0 |
| AS138986JP | WINDCLOUDNETWORK-MO - INAP Japan Tokyo Shiohama DC | — | 16 | 1 |
| AS17684JP | AS17684-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS214772JP | NAZUKI-AS CHEN LUOAN | — | 16 | 1 |
| 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 |
| AS214430JP | xronos Takahiro Fukushima | — | 512 | 2 |
| AS63778JP | BGPNAP2 - Border Gateway Protocol Network Analysis Project | — | 327.7K | 31 |
| AS7669JP | AS7669-10 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS138181JP | HEXHU - Hu's Tech LLC | — | 3 | 2 |
| AS9352JP | KUMAGAYA - KuMaGaYaNet | — | — | 0 |
| AS402917JP | VPSCAT - VPSCAT | — | — | 0 |
| AS7523JP | TECHNOW - RICOH JAPAN Corporation | — | — | 0 |
| AS38222JP | SDCCIX-EAST - Shimane-Japan Internet Exchange | — | — | 0 |
| AS10020JP | AS10020-31 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9373JP | AS9373-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS215239JP | SHOW Show Corporation | — | 512 | 2 |
| AS218871JP | NISHIO-AS Kazuto Nishio | — | 16 | 1 |
| AS4717JP | AI3 - WIDE Project | — | 81.9K | 2 |
| AS56218JP | QGPOP-AS-AP - QGPOP | — | 65.5K | 1 |
| AS4702JP | AS4702-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131157JP | MAGMA-IPV6 - IMS Corporation | — | — | 0 |
| AS152860JP | GJW-KK - GANJINGWORLD K.K. | — | 1 | 1 |
| AS131978JP | NTTCOM-VoIP - NTT DOCOMO BUSINESS,Inc. | — | — | 0 |
| AS2517JP | AS2517-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4698JP | INTERLINK - InterLink Co., Ltd. | — | — | 0 |
| AS213471JP | IPPNOC YAMAMOTO Hiroshi | — | 65 | 5 |
| AS9603JP | AS9603-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9594JP | AS9594-4 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |