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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 |
| AS9608-18 - JPNIC-2Byte-ASBLOCK-AP |
| — |
| — |
| 0 |
| AS9904JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS55903JP | arrownet - Tokyo Stock Exchange, Inc. | — | — | 0 |
| AS23814JP | T-LEX - WIDE Project | — | — | 0 |
| AS23787JP | AS23787-15 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131935JP | KAMOIKE-ORG - Kamoike.net LLP | — | — | 0 |
| AS151068JP | AS-VMW-KUL - VMWare Incorporation | — | — | 0 |
| AS38627JP | BAIDUJP - Baidu, Inc. | — | — | 0 |
| AS131980JP | KINIKUNET - KADOKAWA CORPORATION | — | — | 0 |
| AS137508JP | JP-RAINBOW-20180312 Toko Communications Co., Ltd. | — | — | 0 |
| AS17688JP | AS17688-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4707JP | AS4707-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17525JP | AS17525-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18096JP | AS18096-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24056JP | SINGTEL-EXPAN-JP - Internet Data Centre | — | — | 0 |
| AS23832JP | AS23832-60 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS26132JP | DDPS - DDPS Networks, LLC | — | — | 0 |
| AS131920JP | closip-2 - closip Inc. | — | — | 0 |
| AS140701JP | IDCLEGEND-AS-AP - IDC Legend Corp. | — | — | 0 |
| AS4684JP | NTTPC - NTT PC Communications, Inc. | — | — | 0 |
| AS7519JP | AS7519-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9364JP | AS9364-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9596JP | AS9596-6 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS55873JP | SJMAPNIC-JP - St. Jude Medical | — | — | 0 |
| AS17517JP | AS17517-15 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17945JP | iTV - iTV Co,Ltd | — | — | 0 |
| AS131922JP | LN-NET - leafnet Co.,Ltd. | — | — | 0 |
| AS138695JP | TYIS-AS-AP - TOYO Internet Service Co., Ltd. | — | — | 0 |
| AS147058JP | UNGK-AS-AP - 1200-03-019901 | — | — | 0 |
| AS9352JP | KUMAGAYA - KuMaGaYaNet | — | — | 0 |
| AS402917JP | VPSCAT - VPSCAT | — | — | 0 |
| AS7523JP | TECHNOW - RICOH JAPAN Corporation | — | — | 0 |
| AS9373JP | AS9373-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23638JP | AMIXCOM - AMIXCOM Inc. | — | — | 0 |
| AS131975JP | OedoTelecom - Oedo Telecom Inc | — | — | 0 |
| AS37895JP | RYUKOKU - Ryukoku University | — | — | 0 |
| AS131155JP | HANABI4 - NTT DOCOMO BUSINESS, Inc. | — | — | 0 |
| AS151023JP | TAO_SYDNEY5 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151036JP | TAO_SHANGHAI - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151024JP | TAO_TOKYO - AT&T TAO Cloud Access Node | — | — | 0 |
| AS219352JP | KuronekoServer Tomoya Eriguchi trading as KuronekoServer | — | — | 0 |
| AS17520JP | AS17520-18 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18193JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS23621JP | AS23621-10 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37921JP | AS37921-34 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS38640JP | SAKURA-E - SAKURA Internet Inc. | — | — | 0 |
| AS151072JP | AS-VMW-SIN - VMWare Incorporation | — | — | 0 |