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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 |
| 512 |
| 65.5K |
| 2 |
| AS151350JP | NIPPONCOMMSINC-AS-AP - NIPPON COMMUNICATIONS INC. | 512 | — | 1 |
| AS136761JP | KALYTERO - Kalytero LLC | 512 | — | 1 |
| AS131902JP | LOGICLINKS2 - LogicLinks, Inc. | 512 | — | 2 |
| AS152877JP | NIN - Nintendo Co., Ltd | 512 | 2 | 4 |
| AS152865JP | LC-NET - Tokyo University of Technology Linux Club | 512 | 4 | 2 |
| AS17941JP | BIT-ISLE - Equinix Japan Enterprise K.K. | 512 | — | 2 |
| AS63791JP | DOORNOC-NET - doornoc | 512 | 65.5K | 2 |
| AS215871JP | XTOM-JP xTom Japan Corporation | 512 | 524.8K | 5 |
| AS945JP | JP-77-20220621 HAONAN YANG | 512 | — | 2 |
| AS38074JP | SDCC-AS-AP - SDCC Japan-West Area | 768 | 32.8K | 5 |
| AS146987JP | GMOCL-NET - GMO GlobalSign Holdings K.K. | 768 | — | 3 |
| AS24263JP | HONDA-NET - HONDA MOTOR Co., Ltd. | 768 | — | 3 |
| AS150369JP | Infal - TelHi Corporation | 768 | 65.5K | 4 |
| AS37888JP | HORIBA-NET - HORIBA, Ltd. | 768 | — | 3 |
| AS24283JP | MIEDEN-NET - Mieden Co.,Ltd. | 768 | — | 3 |
| AS55911JP | kazukichi - kazukichi | 768 | 66.1K | 8 |
| AS151380JP | transformedu - Transform Co., Ltd. | 768 | — | 2 |
| AS152645JP | FLEXTECHINC-AS-AP - Flextech Inc. | 768 | 65.5K | 4 |
| AS199767JP | DOVE-AS Pinjia Zhao | 768 | 256 | 3 |
| AS45679JP | TOMOCHA-NET - Tatsumi, Tomo | 768 | 2 | 4 |
| AS131077JP | TOHMATSU-NET - Deloitte Tohmatsu Group LLC | 768 | — | 3 |
| AS63776JP | MERCARI-JP - Mercari, Inc. | 768 | 512 | 4 |
| AS59349JP | GMO-Z-COM - GMO-Z.COM PTE. LTD. | 768 | 1 | 3 |
| AS133900JP | GSI-AP - Gilead Sciences, Inc. | 896 | — | 4 |
| AS10209JP | Synopsys-AS-JP-AP - Japan HUB and Data Center | 1K | — | 3 |
| AS136586JP | INCOMMJAPANKK-AS-AP - InComm Japan K.K. | 1K | — | 3 |
| AS38648JP | F-REGI - F-REGI Co.,Ltd. | 1K | 65.5K | 2 |
| AS4718JP | CKP - Cyber Kansai Project | 1K | 65.5K | 2 |
| AS131942JP | GURUNAVI-NET - Gurunavi, Inc. | 1K | — | 1 |
| AS18279JP | BUKKYO-U - Bukkyo University | 1K | — | 1 |
| AS55907JP | GMO-DNS-R1 - GMO Internet, Inc. | 1K | 3 | 7 |
| AS133476JP | FIRST-AS-AP - First Innovation K.K. | 1K | 65.5K | 2 |
| AS131945JP | SNTU-NET - Sanntuu Corporation | 1K | — | 1 |
| AS55569JP | CRITEO-AS-AP - Criteo APAC | 1K | 14 | 18 |
| AS131963JP | MCDR-KIX - MC Digital Realty, Inc. | 1K | 65.5K | 2 |
| AS7660JP | APAN-JP - Asia Pacific Advanced Network - Japan | 1K | 8.4K | 4 |
| AS18149JP | JPRS - Japan Registry Service Co., Ltd. | 1K | 2 | 5 |
| AS131905JP | JPRS-GTLD - Japan Registry Services Co., Ltd. | 1K | 65.5K | 4 |
| AS138033JP | BBIX-AS-AP - BBIX, Inc | 1K | 65.5K | 5 |
| AS55891JP | WBTSJP-AS - WATCH TOWER BIBLE AND TRACT SOCIETY | 1K | 133.6K | 13 |
| AS55894JP | WHOSNEXT - Who's Next | 1K | — | 1 |
| AS146981JP | Nekojarashi - Nekojarashi Inc. | 1K | 65.5K | 6 |
| AS59097JP | OCH-NET - Okinawa Cross Head Co., Ltd. | 1K | — | 3 |
| AS58645JP | marinet - Miyagi Cable TV Co.,Ltd | 1K | 65.5K | 2 |
| AS55378JP | QUICK-YCCNET - QUICK Corp. | 1K | — | 1 |
| AS131953JP | YUTOPIA-NET - NPO Yutopianet | 1K | — | 3 |