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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 |
| AS37903JP | AS37903-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9375JP | AS9375-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23643JP | AS23643-32 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131154JP | SHOWNET-4AS - NANO OPT Media, Inc. | — | — | 0 |
| AS23782JP | AS23782-10 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23797JP | AS23797-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17933JP | NTT-EAST - Nippon Telegraph and Telephone East Corporation | — | — | 0 |
| AS24047JP | ISC-KIX1 - Internet Systems Consortium, Inc. | — | — | 0 |
| AS18151JP | CEC - COMPUTER ENGINEERING & CONSULTING LTD. | — | — | 0 |
| AS4705JP | AS4705-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131085JP | NCOM-IPv6NET - Niigata Communication Service | — | — | 0 |
| AS152862JP | SOLTIEND - Shiojiri City | — | — | 0 |
| AS17943JP | TDU - Tokyo Denki University | — | — | 0 |
| AS63786JP | MARCHE - Mercari, Inc. | — | — | 0 |
| AS4712JP | JT-Net - JAPAN TOBACCO INC. | — | — | 0 |
| AS136407JP | VIRTUSTREAMJP-AS-AP - Virtustream Cloud Services Australia Pty Limited | — | — | 0 |
| AS17674JP | AS17674-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24281JP | AS24281-34 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17930JP | AS17930-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18067JP | HUMEIA - Humeia Corporation | — | — | 0 |
| AS151019JP | TAO_SINGAPORE3 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS17954JP | AS17954-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9620JP | AS9620-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9909JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS146977JP | AS146977-10 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS3775JP | ERX-IBMAP-MPN - Global Network Solutions, IBM Japan, Ltd. | — | — | 0 |
| AS7518JP | AS7518-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7528JP | AS7528-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131991JP | HELP-NET - JAPAN MAYDAY SERVICE CO., LTD. | — | — | 0 |
| AS151021JP | TAO_HONG_KONG4 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS4701JP | AS4701-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4734JP | AS4734-52 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS63795JP | ROUTEL - RoutelNet | — | — | 0 |
| AS9377JP | AS9377-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS150355JP | BBIX-MAPSRS - BBIX,Inc. | — | — | 0 |
| AS151035JP | TAO_LONDON - AT&T TAO Cloud Access Node | — | — | 0 |
| AS131962JP | AS131962-58 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS4724JP | AS4724-42 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24274JP | AS24274-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS2509JP | AS2509-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131936JP | UMGJP-NET - UNIVERSAL MUSIC LLC | — | — | 0 |
| AS151033JP | TAO_MUMBAI2 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS23636JP | AS23636-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS63788JP | MOCHIYA-NET - MOCHIYA Inc. | — | — | 0 |
| AS9995JP | AS9995-6 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS56291JP | ACE-AS-AP - Ace, Inc. | — | — | 0 |