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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 |
| AS4703JP | AS4703-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151021JP | TAO_HONG_KONG4 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS131968JP | MHBK-CLH-OS - Mizuho Bank, Ltd | — | — | 0 |
| AS136407JP | VIRTUSTREAMJP-AS-AP - Virtustream Cloud Services Australia Pty Limited | — | — | 0 |
| AS138328JP | SASMFL-AS-AP - Skadden, Arps, Slate, Meagher & Flom LLP | — | — | 0 |
| AS18151JP | CEC - COMPUTER ENGINEERING & CONSULTING LTD. | — | — | 0 |
| AS7510JP | AS7510-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS63917JP | AMWAYJAPANGK-JP - 7-1, Udagawacho, | — | — | 0 |
| AS56023JP | SMARTNET-AS-AP - SmartRams Co., Ltd. | — | — | 0 |
| AS37896JP | AS37896-9 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7504JP | AS7504-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23638JP | AMIXCOM - AMIXCOM Inc. | — | — | 0 |
| AS45673JP | OECU-NET - Osaka Electro-Communication University | — | — | 0 |
| AS18086JP | PFU-IDC - PFU LIMITED | — | — | 0 |
| AS9360JP | AS9360-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS153832JP | VALSELLC-AS-AP - Valse LLC | — | — | 0 |
| AS17674JP | AS17674-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS134473JP | TAO_CHICAGO - AT&T TAO Cloud Access Node | — | — | 0 |
| AS17930JP | AS17930-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18067JP | HUMEIA - Humeia Corporation | — | — | 0 |
| AS4681JP | AS4681-10 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37902JP | NOMURA-TRADE - Nomura Research Institute, Ltd. | — | — | 0 |
| AS9620JP | AS9620-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23825JP | AS23825-53 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS3391JP | ERX-ASCII-NET - ASCIInet Corporation | — | — | 0 |
| AS18290JP | AS18290-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7518JP | AS7518-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9612JP | AS9612-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS140683JP | STARBOWLTD-AS-AP - Starbow Ltd. | — | — | 0 |
| AS9222JP | INTEL-ONLINE-SERVICES-ASIA - Intel Online Services Asia | — | — | 0 |
| AS151035JP | TAO_LONDON - AT&T TAO Cloud Access Node | — | — | 0 |
| AS150361JP | NTTW-WFL-AS - NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION | — | — | 0 |
| AS17528JP | AS17528-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18133JP | AS18133-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131908JP | Intec-DCAN - INTEC Inc. | — | — | 0 |
| AS136796JP | CL-JP-AS - CORELINK JAPAN | — | — | 0 |
| AS134703JP | JCIX - Japan Community IX Association | — | — | 0 |
| AS17508JP | AS17508-6 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24274JP | AS24274-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7688JP | AS7688-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS132373JP | ASIAN-WEB-JP - Neomet Aoyama BLDG.3F 2-7-13 Shibuya | — | — | 0 |
| AS4728JP | AS4728-46 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37903JP | AS37903-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37927JP | NOMURATRADE - Nomura Researth Institute, Ltd. | — | — | 0 |
| AS17942JP | AS17942-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151065JP | AS-VMW-BKK - VMWare Incorporation | — | — | 0 |