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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.
1,300 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. | 4M | 236 |
| 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 |
| AS23812JP | AS23812-40 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9608JP | AS9608-18 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17520JP | AS17520-18 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4734JP | AS4734-52 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4720JP | AS4720-38 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4707JP | AS4707-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18152JP | AS18152-32 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS55389JP | JPNE - Japan Internet Xing Co., Ltd. | — | — | 0 |
| AS55377JP | Sadaitec - Sadiatec Co., Ltd | — | — | 0 |
| AS9598JP | MPLS-OCN - NTT DOCOMO BUSINESS,Inc. | — | — | 0 |
| AS9369JP | AS9369-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17517JP | AS17517-15 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS55908JP | NOMURA-NET - Nomura Research Institute,Ltd. | — | — | 0 |
| AS219065JP | CYH-AS CHENGYUAN HE | — | 16 | 1 |
| AS215239JP | SHOW Show Corporation | — | 512 | 2 |
| AS56218JP | QGPOP-AS-AP - QGPOP | — | 65.5K | 1 |
| AS150361JP | NTTW-WFL-AS - NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION | — | — | 0 |
| AS38646JP | BENKYO-NET - Neodyland | — | 1 | 1 |
| AS37890JP | AS37890-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24267JP | AS24267-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS132592JP | STARCOLTD-AS-AP - Star Co,.Ltd. | — | — | 0 |
| AS7688JP | AS7688-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17508JP | AS17508-6 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17951JP | AS17951-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4679JP | AS4679-8 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS152866JP | GTT-NET - General Incorporated Foundation GovTechTokyo | — | — | 0 |
| AS131085JP | NCOM-IPv6NET - Niigata Communication Service | — | — | 0 |
| AS2517JP | AS2517-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23638JP | AMIXCOM - AMIXCOM Inc. | — | — | 0 |
| AS9606JP | ISAS-AS - Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency | — | — | 0 |
| AS7508JP | AS7508-9 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9603JP | AS9603-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9373JP | AS9373-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4683JP | AS4683-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9904JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS4674JP | AS4674-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS214699JP | ROSETTA-MNT LIU JIARONG | — | — | 0 |
| AS17674JP | AS17674-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37924JP | KKR-MLIT-AS - Ministry of Land, Infrastructure and Transport Kinki Regional Development Bureau | — | — | 0 |
| AS131978JP | NTTCOM-VoIP - NTT DOCOMO BUSINESS,Inc. | — | — | 0 |
| AS131947JP | NOS-SERVICE - Net One Systems Co., Ltd. | — | — | 0 |
| AS131083JP | MARCHE-LAB - Mercari, Inc. | — | — | 0 |
| AS18269JP | KAI - Kai Creates Inc. | — | — | 0 |
| AS18147JP | AS18147-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17949JP | TEU - Tokyo University of Technorogy | — | — | 0 |
| AS10020JP | AS10020-31 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |