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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.
1,297 autonomous systems registered to Japan. Click an AS for detail.
| 669 |
| AS17506JP | UCOM - ARTERIA Networks Corporation | 5.5M | 41 |
| AS2497JP | IIJ - Internet Initiative Japan Inc. | 4M | 205 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 36 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 67 |
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| 0 |
| AS56033JP | RAKUIP-AS-AP - Rakushasu Inc | — | — | 0 |
| AS37894JP | AS37894-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS38650JP | JMSU-NET - JMS-United Co., Ltd. | — | — | 0 |
| AS37925JP | USEN-WEST - USEN CORPORATION | — | — | 0 |
| AS4707JP | AS4707-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23626JP | AS23626-15 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS55389JP | JPNE - Japan Internet Xing Co., Ltd. | — | — | 0 |
| AS37902JP | NOMURA-TRADE - Nomura Research Institute, Ltd. | — | — | 0 |
| AS23621JP | AS23621-10 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7680JP | AS7680-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4676JP | AS4676-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS59114JP | RECRUIT - Recruit Co., Ltd. | — | — | 0 |
| AS55375JP | SI-NET - SmartInsight Inc. | — | — | 0 |
| AS7531JP | GENOME - GenomeNet Project | — | — | 0 |
| AS140701JP | IDCLEGEND-AS-AP - IDC Legend Corp. | — | — | 0 |
| AS138038JP | WOLFLAB-AS-AP - Wolf Network Lab | — | — | 0 |
| AS131086JP | AVISNET-4 - Densan Co., Ltd. | — | — | 0 |
| AS18089JP | HIKARI-NWC - KDDI Corporation | — | — | 0 |
| AS131920JP | closip-2 - closip Inc. | — | — | 0 |
| AS59130JP | MHDD-NET - NTT DOCOMO BUSINESS, Inc. | — | — | 0 |
| AS7666JP | OKIX-1 - Mitsubishi Corporation | — | — | 0 |
| AS10020JP | AS10020-31 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS26132JP | DDPS - DDPS Networks, LLC | — | — | 0 |
| AS131073JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS139072JP | WEWORK-AS-AP - Wework Singapore Pte. Ltd. | — | — | 0 |
| AS138986JP | WINDCLOUDNETWORK-MO - INAP Japan Tokyo Shiohama DC | — | 16 | 1 |
| AS38637JP | MAHOROBA-AS - Mahoroba Kobo, Inc. | — | — | 0 |
| AS24056JP | SINGTEL-EXPAN-JP - Internet Data Centre | — | — | 0 |
| AS151382JP | AS151382-12 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS7603JP | GENECOMPUTINGLTD-AS-AP - Gene Computing Ltd | — | — | 0 |
| AS9909JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS37890JP | AS37890-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9376JP | SAKURANET - SMARTVALUE Co.,Ltd. | — | — | 0 |
| AS146973JP | voip-enecom - Enecom,Inc. | — | — | 0 |
| AS151381JP | AS151381-11 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS55908JP | NOMURA-NET - Nomura Research Institute,Ltd. | — | — | 0 |
| AS9373JP | AS9373-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151372JP | AS151372-2 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS138321JP | Lunasla - Lunasla Inc. | — | — | 0 |
| AS151022JP | TAO_SYDNEY3 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS150362JP | Kuriyama-Net - Mamireimu Net Work's | — | — | 0 |
| AS10005JP | AS10005-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9998JP | ISAO - ISAO Corporation | — | — | 0 |
| AS151071JP | AS-VMW-ICN - VMWare Incorporation | — | — | 0 |
| AS131978JP | NTTCOM-VoIP - NTT DOCOMO BUSINESS,Inc. | — | — | 0 |
| AS9368JP | AS9368-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |