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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 |
| AS17533JP | AS17533-31 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17677JP | MIINET - ARTERIA Networks Corporation | — | — | 0 |
| AS137407JP | EICINC-AS-AP - EIC INC | — | — | 0 |
| AS18084JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS23806JP | HBS - Chupicom Inc. | — | — | 0 |
| AS9360JP | AS9360-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS38655JP | SaiNet-AS2 - SaiNet Corporation | — | — | 0 |
| AS63796JP | AS63796-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23829JP | AS23829-57 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7525JP | AS7525-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS38650JP | JMSU-NET - JMS-United Co., Ltd. | — | — | 0 |
| AS23835JP | AS23835-63 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23834JP | AS23834-62 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23823JP | AS23823-51 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4688JP | HI-HO - Internet Initiative Japan Inc. | — | — | 0 |
| AS7528JP | AS7528-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS152867JP | TCNET - Takaoka cable network | — | — | 0 |
| AS23929JP | Ubiquitous-AS - Ubiquitous Corp. Data Center Network. | — | — | 0 |
| AS4714JP | AS4714-32 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4708JP | AS4708-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS38610JP | APNIC-JP-RD - APNIC Research and Development | — | — | 0 |
| AS4726JP | AS4726-44 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18132JP | AS18132-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151035JP | TAO_LONDON - AT&T TAO Cloud Access Node | — | — | 0 |
| AS17690JP | AS17690-18 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151602JP | UTC-AS-AP - UD Trucks Corporation | — | — | 0 |
| AS10807JP | ERX-HOLE-IN-ONE - Hitachi Business International, Ltd. | — | — | 0 |
| AS152728JP | NIPPONCOMMSINC-AS-AP - NIPPON COMMUNICATIONS INC. | — | — | 0 |
| AS55903JP | arrownet - Tokyo Stock Exchange, Inc. | — | — | 0 |
| AS9596JP | AS9596-6 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS137508JP | JP-RAINBOW-20180312 Toko Communications Co., Ltd. | — | — | 0 |
| AS10009JP | AS10009-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9996JP | KDDIIP-VPN - KDDI Corporation | — | — | 0 |
| AS10007JP | IPR - SoftBank Corp. | — | — | 0 |
| AS131078JP | KDDLAB-4OCT - KDDI Research, Inc. | — | — | 0 |
| AS150296JP | ONENEXTNET-AS-AP - 1NextNet | — | — | 0 |
| AS17521JP | KUT - Kochi University of Technology | — | — | 0 |
| AS7661JP | AS7661-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS132496JP | SBIBITS-AS-AP - SBI BITS Co., Ltd. | — | — | 0 |
| AS9434JP | ABONE-AS-AP - Internet Initiative Japan, Inc. | — | — | 0 |
| AS17704JP | AS17704-32 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17952JP | AS17952-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7519JP | AS7519-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18079JP | AS18079-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7688JP | AS7688-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9603JP | AS9603-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |