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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.
1,300 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. | 4M | 236 |
| 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 |
| AS4710JP | NTTV6NET2 - Nippon Telegraph and Telephone Corporation | — | — | 0 |
| AS135304JP | VMWARE-AS-AP - VMWare Incorporation | — | — | 0 |
| AS199767JP | DOVE-AS Pinjia Zhao | — | 256 | 1 |
| AS17696JP | AS17696-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4731JP | AS4731-49 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS146970JP | BBS - BBSakura Networks, Inc. | — | — | 0 |
| AS45682JP | ASN-EXCITE - Excite Japan Co., Ltd. | — | — | 0 |
| AS18146JP | InetCore - Intec NetCore, Inc. | — | — | 0 |
| AS4733JP | AS4733-51 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131154JP | SHOWNET-4AS - NANO OPT Media, Inc. | — | — | 0 |
| AS63917JP | AMWAYJAPANGK-JP - 7-1, Udagawacho, | — | — | 0 |
| AS24047JP | ISC-KIX1 - Internet Systems Consortium, Inc. | — | — | 0 |
| AS17522JP | NTT-WEST - NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION | — | — | 0 |
| AS4715JP | AS4715-33 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151022JP | TAO_SYDNEY3 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS138632JP | ENMOE-AS-AP - Enmoe Network | — | — | 0 |
| AS9409JP | RAPIDFIREYJP-AS-AP - Rapid-Fire-y (Tokyo) | — | — | 0 |
| AS9364JP | AS9364-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS134358JP | TAO_ASHBURN - AT&T TAO Cloud Access Node | — | — | 0 |
| AS152150JP | MENLO-SEC-JP - Menlo Security Japan K.K. | — | — | 0 |
| AS137072JP | LEONCOLTD-AS-AP - LEON CO.LTD | — | — | 0 |
| AS131927JP | TVM - TV Matsumoto Cablevision | — | — | 0 |
| AS26132JP | DDPS - DDPS Networks, LLC | — | — | 0 |
| AS23617JP | AS23617-6 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24056JP | SINGTEL-EXPAN-JP - Internet Data Centre | — | — | 0 |
| AS18132JP | AS18132-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9743JP | NIPPONEDUIX-AS-AP - Nippon EDUIX | — | 1 | 1 |
| AS56025JP | KARSCOLTD-AS-AP - Kars co.ltd. | — | — | 0 |
| AS7504JP | AS7504-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4706JP | AS4706-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131084JP | MKInet-JP - MKI Network Solutions, Ltd. | — | — | 0 |
| AS37913JP | AS37913-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37909JP | IKUEIKAN-NET - Ikueikan University | — | — | 0 |
| AS23821JP | AS23821-49 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23792JP | AS23792-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18080JP | SOPIA - Sopiafons Co.,Ltd | — | — | 0 |
| AS17674JP | AS17674-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23815JP | JPIX-RS - Japan Internet Xing Co., Ltd. | — | — | 0 |
| AS38655JP | SaiNet-AS2 - SaiNet Corporation | — | — | 0 |
| AS23825JP | AS23825-53 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23612JP | AS23612-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4728JP | AS4728-46 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4714JP | AS4714-32 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS56291JP | ACE-AS-AP - Ace, Inc. | — | — | 0 |
| AS151033JP | TAO_MUMBAI2 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS131082JP | JPIX-4 - Japan Internet Xing Co., Ltd. | — | — | 0 |