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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.
1,303 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. | 4.2M | 269 |
| 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 |
| AS4689JP | AS4689-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS142584JP | IMAGINGBAYINC-AS-AP - Imaging Bay, Inc. | — | — | 0 |
| AS146977JP | AS146977-10 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS213471JP | IPPNOC YAMAMOTO Hiroshi | — | 65 | 5 |
| AS4731JP | AS4731-49 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS133229JP | SKIPLLC-AS-AP - SKIP LLC | — | — | 0 |
| AS45682JP | ASN-EXCITE - Excite Japan Co., Ltd. | — | — | 0 |
| AS23819JP | AS23819-47 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9992JP | AS9992-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4684JP | NTTPC - NTT PC Communications, Inc. | — | — | 0 |
| AS131080JP | SAKURA-D - SAKURA Internet Inc. | — | — | 0 |
| AS37896JP | AS37896-9 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23885JP | ORACLEV6-AS-AP - Oracle Corporation | — | — | 0 |
| AS9376JP | SAKURANET - SMARTVALUE Co.,Ltd. | — | — | 0 |
| AS3775JP | ERX-IBMAP-MPN - Global Network Solutions, IBM Japan, Ltd. | — | — | 0 |
| AS151372JP | AS151372-2 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS9596JP | AS9596-6 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9364JP | AS9364-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7519JP | AS7519-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131972JP | JST-Sendai - J-Stream Inc. | — | — | 0 |
| AS140701JP | IDCLEGEND-AS-AP - IDC Legend Corp. | — | — | 0 |
| AS131920JP | closip-2 - closip Inc. | — | — | 0 |
| AS26132JP | DDPS - DDPS Networks, LLC | — | — | 0 |
| AS23832JP | AS23832-60 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24056JP | SINGTEL-EXPAN-JP - Internet Data Centre | — | — | 0 |
| AS18096JP | AS18096-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17525JP | AS17525-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS10807JP | ERX-HOLE-IN-ONE - Hitachi Business International, Ltd. | — | — | 0 |
| AS152862JP | SOLTIEND - Shiojiri City | — | — | 0 |
| AS131084JP | MKInet-JP - MKI Network Solutions, Ltd. | — | — | 0 |
| AS59113JP | RJV6-NET - RICOH JAPAN Corporation | — | — | 0 |
| AS37909JP | IKUEIKAN-NET - Ikueikan University | — | — | 0 |
| AS23821JP | AS23821-49 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23792JP | AS23792-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18098JP | AS18098-14 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS10026JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS4692JP | INTERGATE - InternetWare Co., LTD. | — | — | 0 |
| AS23802JP | AS23802-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18137JP | AS18137-17 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23825JP | AS23825-53 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18273JP | AS18273-15 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4728JP | AS4728-46 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS2509JP | AS2509-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151033JP | TAO_MUMBAI2 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS134532JP | ATT-NBE-JP - ATT NBE Equinix Tokyo | — | — | 0 |
| AS134473JP | TAO_CHICAGO - AT&T TAO Cloud Access Node | — | — | 0 |