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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.
1,297 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 | 206 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
| — |
| 0 |
| AS131906JP | GAPINC-NET - Gap Japan K.K. | — | — | 0 |
| AS9613JP | AS9613-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9616JP | MuX - WIDE Project | — | — | 0 |
| AS56024JP | KARSCOLTD-AS-AP - KARSCOLTD-JP | — | — | 0 |
| AS151015JP | TAO_FRANKFURT - AT&T TAO Cloud Access Node | — | — | 0 |
| AS2554JP | IDCF2554 - IDC Frontier Inc. | — | — | 0 |
| AS9349JP | AS9349-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18085JP | INFOVALLEY - Fujitsu Systems Applications & Support Limited | — | — | 0 |
| AS146970JP | BBS - BBSakura Networks, Inc. | — | — | 0 |
| AS38715JP | Tottori-Regional-IX-AS - Regional-IX ASN Tottori pref Japan. | — | — | 0 |
| AS38895JP | AMAZON-AS-AP - Amazon.com Tech Telecom | — | — | 0 |
| AS9625JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS23643JP | AS23643-32 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24567JP | QTINC-AS-AP - QT Inc. | — | — | 0 |
| AS17531JP | AS17531-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS38080JP | FSW-Tohoku-POP - Foresightwave INC. | — | — | 0 |
| AS9599JP | INFOPEPPER - EJWORKS CORPORATION | — | — | 0 |
| AS23796JP | AS23796-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7525JP | AS7525-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4706JP | AS4706-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18138JP | SAKURA-G - SAKURA Internet Inc. | — | — | 0 |
| AS17952JP | AS17952-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS59112JP | PLUSONE - Plus One marketing Ltd. | — | — | 0 |
| AS152728JP | NIPPONCOMMSINC-AS-AP - NIPPON COMMUNICATIONS INC. | — | — | 0 |
| AS151034JP | TAO_MUMBAI3 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS56023JP | SMARTNET-AS-AP - SmartRams Co., Ltd. | — | — | 0 |
| AS151013JP | TAO_LONDON - AT&T TAO Cloud Access Node | — | — | 0 |
| AS17930JP | AS17930-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24292JP | AS24292-45 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7526JP | MIND-US - Mitsubishi Electric Information Network Corporation | — | — | 0 |
| AS4689JP | AS4689-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4672JP | AS4672-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37913JP | AS37913-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23834JP | AS23834-62 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24266JP | AS24266-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18098JP | AS18098-14 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18130JP | AS18130-10 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17696JP | AS17696-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23794JP | BMCDN - Broadmedia Corporation | — | — | 0 |
| AS9612JP | AS9612-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9610JP | AS9610-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4681JP | AS4681-10 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7528JP | AS7528-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37981JP | TYIS-AS-AP - TOYO Internet Service Co., Ltd. | — | — | 0 |
| AS151019JP | TAO_SINGAPORE3 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151016JP | TAO_DALLAS - AT&T TAO Cloud Access Node | — | — | 0 |