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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 |
| AS7519JP | AS7519-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9364JP | AS9364-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9596JP | AS9596-6 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151372JP | AS151372-2 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS3775JP | ERX-IBMAP-MPN - Global Network Solutions, IBM Japan, Ltd. | — | — | 0 |
| AS9376JP | SAKURANET - SMARTVALUE Co.,Ltd. | — | — | 0 |
| AS17525JP | AS17525-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37896JP | AS37896-9 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131080JP | SAKURA-D - SAKURA Internet Inc. | — | — | 0 |
| AS131972JP | JST-Sendai - J-Stream Inc. | — | — | 0 |
| AS134473JP | TAO_CHICAGO - AT&T TAO Cloud Access Node | — | — | 0 |
| AS134532JP | ATT-NBE-JP - ATT NBE Equinix Tokyo | — | — | 0 |
| AS151033JP | TAO_MUMBAI2 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS2509JP | AS2509-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4728JP | AS4728-46 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18273JP | AS18273-15 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23825JP | AS23825-53 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18137JP | AS18137-17 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS152862JP | SOLTIEND - Shiojiri City | — | — | 0 |
| AS4707JP | AS4707-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131975JP | OedoTelecom - Oedo Telecom Inc | — | — | 0 |
| AS55873JP | SJMAPNIC-JP - St. Jude Medical | — | — | 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 |
| AS4727JP | BSS - KYODO PRINTING BUSINESS SOLUTIONS CO.,LTD | — | — | 0 |
| AS9608JP | 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 |
| AS10807JP | ERX-HOLE-IN-ONE - Hitachi Business International, Ltd. | — | — | 0 |