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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 |
| AS152864JP | NTT-WEST-CCS - NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION | — | — | 0 |
| AS9606JP | ISAS-AS - Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency | — | — | 0 |
| AS214699JP | ROSETTA-MNT LIU JIARONG | — | — | 0 |
| AS55873JP | SJMAPNIC-JP - St. Jude Medical | — | — | 0 |
| AS151075JP | AS-VMW-NRT - VMWare Incorporation | — | — | 0 |
| AS146978JP | BBIX-Fukuoka - BBIX, Inc. | — | — | 0 |
| AS18147JP | AS18147-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17700JP | AS17700-28 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9598JP | MPLS-OCN - NTT DOCOMO BUSINESS,Inc. | — | — | 0 |
| AS10020JP | AS10020-31 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4717JP | AI3 - WIDE Project | — | 81.9K | 2 |
| AS18096JP | AS18096-12 - 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 |
| AS17525JP | AS17525-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23787JP | AS23787-15 - 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 |
| AS214430JP | xronos Takahiro Fukushima | — | 512 | 2 |
| AS37921JP | AS37921-34 - JPNIC-2Byte-ASBLOCK-AP | — | — | 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 |
| AS132726JP | SANYUNETCORP-JP - 5-3 Miyuki-cho | — | — | 0 |
| AS38640JP | SAKURA-E - SAKURA Internet Inc. | — | — | 0 |
| AS151072JP | AS-VMW-SIN - VMWare Incorporation | — | — | 0 |
| AS4707JP | AS4707-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 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 |