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How Japan ranks worldwide on dormant space, the transfer market, routing security and address density.
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 |
| AS17949JP | TEU - Tokyo University of Technorogy | — | — | 0 |
| AS4708JP | AS4708-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37903JP | AS37903-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7691JP | AS7691-32 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17513JP | AS17513-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151035JP | TAO_LONDON - AT&T TAO Cloud Access Node | — | — | 0 |
| AS4727JP | BSS - KYODO PRINTING BUSINESS SOLUTIONS CO.,LTD | — | — | 0 |
| AS18086JP | PFU-IDC - PFU LIMITED | — | — | 0 |
| AS151073JP | AS-VMW-SYD - VMWare Incorporation | — | — | 0 |
| AS37923JP | FIC - NTT DOCOMO BUSINESS, Inc. | — | — | 0 |
| AS63795JP | ROUTEL - RoutelNet | — | — | 0 |
| AS18275JP | AS18275-17 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23812JP | AS23812-40 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4716JP | POWEREDCOM - KDDI CORPORATION | — | — | 0 |
| AS7673JP | ALLES - ejworks corporation | — | — | 0 |
| AS10009JP | AS10009-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4709JP | NETLAPUTA - NetLaputa Corporation | — | — | 0 |
| AS23806JP | HBS - Chupicom Inc. | — | — | 0 |
| AS151072JP | AS-VMW-SIN - VMWare Incorporation | — | — | 0 |
| AS151016JP | TAO_DALLAS - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151068JP | AS-VMW-KUL - VMWare Incorporation | — | — | 0 |
| AS55906JP | AS55906-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151029JP | TAO_MIAMI1 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS7661JP | AS7661-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7681JP | AS7681-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151013JP | TAO_LONDON - AT&T TAO Cloud Access Node | — | — | 0 |
| AS2517JP | AS2517-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS59101JP | AS59101-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18138JP | SAKURA-G - SAKURA Internet Inc. | — | — | 0 |
| AS38080JP | FSW-Tohoku-POP - Foresightwave INC. | — | — | 0 |
| AS140642JP | WASABI-AS-AP - Wasabi Technologies Inc. | — | — | 0 |
| AS24297JP | FCN - University Public Corporation Osaka | — | — | 0 |
| AS131947JP | NOS-SERVICE - Net One Systems Co., Ltd. | — | — | 0 |
| AS18265JP | AS18265-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131967JP | MHBK-CLH-TY - Mizuho Bank, Ltd | — | — | 0 |
| AS23796JP | AS23796-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23802JP | AS23802-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37913JP | AS37913-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS63524JP | ASN-EQIX-CLOUD-OS - Equinix Asia Pacific | — | — | 0 |
| AS18098JP | AS18098-14 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37899JP | NTTW-NGN-AS - NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION | — | — | 0 |
| AS24269JP | AS24269-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23663JP | YAHOO-BANGALORE-AS-AP - Yahoo Bangalore Network Monitoring Center | — | — | 0 |
| AS18082JP | LASDEC - Japan Agency for Local Authority Information Systems | — | — | 0 |
| AS24266JP | AS24266-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9611JP | AS9611-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |