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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 |
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| 0 |
| AS9594JP | AS9594-4 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4709JP | NETLAPUTA - NetLaputa Corporation | — | — | 0 |
| AS151073JP | AS-VMW-SYD - VMWare Incorporation | — | — | 0 |
| AS151401JP | CYBERVISIONHOSTING-AS-AP - Cybervision Hosting Co Ltd | — | — | 0 |
| AS55372JP | OIX - University of the Ryukyus | — | — | 0 |
| AS38645JP | NTTCOM-GRX - NTT DOCOMO BUSINESS, Inc. | — | — | 0 |
| AS4727JP | BSS - KYODO PRINTING BUSINESS SOLUTIONS CO.,LTD | — | — | 0 |
| AS37925JP | USEN-WEST - USEN CORPORATION | — | — | 0 |
| AS23803JP | HGC - The University of Tokyo | — | — | 0 |
| AS55377JP | Sadaitec - Sadiatec Co., Ltd | — | — | 0 |
| AS9743JP | NIPPONEDUIX-AS-AP - Nippon EDUIX | — | 1 | 1 |
| AS38646JP | BENKYO-NET - Neodyland | — | 1 | 1 |
| AS56218JP | QGPOP-AS-AP - QGPOP | — | 65.5K | 1 |
| AS23663JP | YAHOO-BANGALORE-AS-AP - Yahoo Bangalore Network Monitoring Center | — | — | 0 |
| AS63778JP | BGPNAP2 - Border Gateway Protocol Network Analysis Project | — | 327.7K | 31 |
| AS214430JP | xronos Takahiro Fukushima | — | 512 | 2 |
| AS37890JP | AS37890-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS150361JP | NTTW-WFL-AS - NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION | — | — | 0 |
| AS38610JP | APNIC-JP-RD - APNIC Research and Development | — | — | 0 |
| AS37901JP | NTTE-NGN-AS - NIPPON TELEGRAPH AND TELEPHONE EAST CORPORATION | — | — | 0 |
| AS132592JP | STARCOLTD-AS-AP - Star Co,.Ltd. | — | — | 0 |
| AS151014JP | TAO_AMSTERDAM - AT&T TAO Cloud Access Node | — | — | 0 |
| AS7688JP | AS7688-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS146983JP | OUXNET - Osaka University | — | — | 0 |
| AS131956JP | SNOW-VPN - NTT DOCOMO BUSINESS, Inc. | — | — | 0 |
| AS56024JP | KARSCOLTD-AS-AP - KARSCOLTD-JP | — | — | 0 |
| AS37926JP | AS37926-39 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17951JP | AS17951-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18280JP | AS18280-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7603JP | GENECOMPUTINGLTD-AS-AP - Gene Computing Ltd | — | — | 0 |
| AS55389JP | JPNE - Japan Internet Xing Co., Ltd. | — | — | 0 |
| AS4674JP | AS4674-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS2499JP | ipv4exh-lab - Japan Network Information Center | — | — | 0 |
| AS401655JP | TRANSVISIONNET - TransVision LLC | — | — | 0 |
| AS4251JP | ERX-TWICS - TWICS Co. Ltd. | — | — | 0 |
| AS151074JP | AS-VMW-TPE - VMWare Incorporation | — | — | 0 |
| AS150362JP | Kuriyama-Net - Mamireimu Net Work's | — | — | 0 |
| AS18273JP | AS18273-15 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4734JP | AS4734-52 - 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 |