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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.
1,300 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. | 4M | 236 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
| 512 |
| 2 |
| 4 |
| AS131902JP | LOGICLINKS2 - LogicLinks, Inc. | 512 | — | 2 |
| AS55909JP | kochi-ct - National Institute of Technology, Kochi College | 512 | 1 | 4 |
| AS59098JP | Hinaturu-Net - Mamireimu Net Work's | 512 | 4.1K | 3 |
| AS146974JP | WP-NET - Woven by Toyota, Inc. | 512 | 65.5K | 2 |
| AS152865JP | LC-NET - Tokyo University of Technology Linux Club | 512 | 4 | 2 |
| AS150356JP | GMO-BRS - GMO BRAND SECURITY Inc. | 512 | — | 1 |
| AS133782JP | ELSEVIER-ASIAPACIFIC-AS-AP - Elsevier Ltd | 512 | — | 2 |
| AS139255JP | U-NEXT-AS-AP - U-NEXT Co.,Ltd. | 512 | — | 2 |
| AS63781JP | KFNET-AS - Kobayashi Family Net LLP | 512 | 65.5K | 3 |
| AS142052JP | MEMPOOLSPACEKK-AS-AP - Mempool Space K.K. | 512 | 2 | 4 |
| AS151350JP | NIPPONCOMMSINC-AS-AP - NIPPON COMMUNICATIONS INC. | 512 | — | 1 |
| AS38636JP | DENA-NET - DeNA, Co. Ltd. | 512 | 3 | 5 |
| AS63806JP | MENHERA - Human-life Information Platforms Institute | 512 | 514 | 6 |
| AS63791JP | DOORNOC-NET - doornoc | 512 | 65.5K | 2 |
| AS151371JP | PAINA - PAINA Information Development | 512 | 65.5K | 2 |
| AS38656JP | Loutres - Loutres | 512 | 1 | 3 |
| AS63776JP | MERCARI-JP - Mercari, Inc. | 768 | 512 | 4 |
| AS146987JP | GMOCL-NET - GMO GlobalSign Holdings K.K. | 768 | — | 3 |
| AS59349JP | GMO-Z-COM - GMO-Z.COM PTE. LTD. | 768 | 1 | 3 |
| AS131077JP | TOHMATSU-NET - Deloitte Tohmatsu Group LLC | 768 | — | 3 |
| AS152645JP | FLEXTECHINC-AS-AP - Flextech Inc. | 768 | 65.5K | 4 |
| AS38074JP | SDCC-AS-AP - SDCC Japan-West Area | 768 | 32.8K | 5 |
| AS55911JP | kazukichi - kazukichi | 768 | 66.1K | 8 |
| AS24263JP | HONDA-NET - HONDA MOTOR Co., Ltd. | 768 | — | 3 |
| AS37888JP | HORIBA-NET - HORIBA, Ltd. | 768 | — | 3 |
| AS24283JP | MIEDEN-NET - Mieden Co.,Ltd. | 768 | — | 3 |
| AS45679JP | TOMOCHA-NET - Tatsumi, Tomo | 768 | 2 | 4 |
| AS150369JP | Infal - TelHi Corporation | 768 | 65.5K | 4 |
| AS133900JP | GSI-AP - Gilead Sciences, Inc. | 896 | — | 4 |
| AS55393JP | MIDOKURA - Midokura Japan K.K. | 1K | — | 4 |
| AS131945JP | SNTU-NET - Sanntuu Corporation | 1K | — | 1 |
| AS55382JP | HOT-CHA - Nagato city office | 1K | — | 1 |
| AS55891JP | WBTSJP-AS - WATCH TOWER BIBLE AND TRACT SOCIETY | 1K | 133.6K | 13 |
| AS138033JP | BBIX-AS-AP - BBIX, Inc | 1K | 65.5K | 5 |
| AS58645JP | marinet - Miyagi Cable TV Co.,Ltd | 1K | 65.5K | 2 |
| AS136586JP | INCOMMJAPANKK-AS-AP - InComm Japan K.K. | 1K | — | 3 |
| AS59097JP | OCH-NET - Okinawa Cross Head Co., Ltd. | 1K | — | 3 |
| AS55894JP | WHOSNEXT - Who's Next | 1K | — | 1 |
| AS153929JP | ABI-AS-AP - Allied Business Inc. | 1K | 256 | 5 |
| AS133476JP | FIRST-AS-AP - First Innovation K.K. | 1K | — | 1 |
| AS18279JP | BUKKYO-U - Bukkyo University | 1K | — | 1 |
| AS131963JP | MCDR-KIX - MC Digital Realty, Inc. | 1K | 65.5K | 2 |
| AS55378JP | QUICK-YCCNET - QUICK Corp. | 1K | — | 1 |
| AS146981JP | Nekojarashi - Nekojarashi Inc. | 1K | 65.5K | 6 |
| AS131942JP | GURUNAVI-NET - Gurunavi, Inc. | 1K | — | 1 |
| AS38648JP | F-REGI - F-REGI Co.,Ltd. | 1K | 65.5K | 2 |