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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 |
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| 0 |
| AS55903JP | arrownet - Tokyo Stock Exchange, Inc. | — | — | 0 |
| AS131985JP | MAT-NET - Maple Audio Technology Corp | — | — | 0 |
| AS151037JP | TAO_BEIJING - AT&T TAO Cloud Access Node | — | — | 0 |
| AS17704JP | AS17704-32 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23637JP | BI-CDN-IX - Equinix Japan Enterprise K.K. | — | — | 0 |
| AS59100JP | kochi-gc - Kochi Gakuen College | — | — | 0 |
| AS17520JP | AS17520-18 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17528JP | AS17528-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7517JP | AS7517-18 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131157JP | MAGMA-IPV6 - IMS Corporation | — | — | 0 |
| AS37927JP | NOMURATRADE - Nomura Researth Institute, Ltd. | — | — | 0 |
| AS45436JP | GRNT-JP-AS-AP - Green Net Co., Ltd. | — | — | 0 |
| AS38222JP | SDCCIX-EAST - Shimane-Japan Internet Exchange | — | — | 0 |
| AS23812JP | AS23812-40 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS38033JP | YAHOO-JP2-AP - internet content provider | — | — | 0 |
| AS18085JP | INFOVALLEY - Fujitsu Systems Applications & Support Limited | — | — | 0 |
| AS7673JP | ALLES - ejworks corporation | — | — | 0 |
| AS18084JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS17933JP | NTT-EAST - Nippon Telegraph and Telephone East Corporation | — | — | 0 |
| AS4672JP | AS4672-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4251JP | ERX-TWICS - TWICS Co. Ltd. | — | — | 0 |
| AS131947JP | NOS-SERVICE - Net One Systems Co., Ltd. | — | — | 0 |
| AS4735JP | AS4735-53 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24274JP | AS24274-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9598JP | MPLS-OCN - NTT DOCOMO BUSINESS,Inc. | — | — | 0 |
| AS152728JP | NIPPONCOMMSINC-AS-AP - NIPPON COMMUNICATIONS INC. | — | — | 0 |
| AS9359JP | AS9359-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17702JP | AS17702-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18270JP | TOIN - Toin University of Yokohama | — | — | 0 |
| AS45686JP | RFEED - INTERNET MULTIFEED CO. | — | — | 0 |
| AS151074JP | AS-VMW-TPE - VMWare Incorporation | — | — | 0 |
| AS9363JP | FNETS - FUJITSU NETWORK SOLUTIONS LIMITED | — | — | 0 |
| AS146978JP | BBIX-Fukuoka - BBIX, Inc. | — | — | 0 |
| AS55817JP | NTTECL-AS-AP - Nippon Telegraph and Telephone Corporation PF Labs | — | — | 0 |
| AS135304JP | VMWARE-AS-AP - VMWare Incorporation | — | — | 0 |
| AS59101JP | AS59101-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS133229JP | SKIPLLC-AS-AP - SKIP LLC | — | — | 0 |
| AS38632JP | XCON - cross-connect niigata co.,ltd. | — | — | 0 |
| AS55873JP | SJMAPNIC-JP - St. Jude Medical | — | — | 0 |
| AS24297JP | FCN - University Public Corporation Osaka | — | — | 0 |
| AS23625JP | TOKAI-WBS - TOKAI Communications Corporation | — | — | 0 |
| AS38080JP | FSW-Tohoku-POP - Foresightwave INC. | — | — | 0 |
| AS18089JP | HIKARI-NWC - KDDI Corporation | — | — | 0 |
| AS23802JP | AS23802-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37913JP | AS37913-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17531JP | AS17531-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |