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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 |
| 1K |
| — |
| 1 |
| AS138033JP | BBIX-AS-AP - BBIX, Inc | 1K | 65.5K | 5 |
| AS23799JP | NDA - National Defense Academy | 1K | — | 4 |
| AS131160JP | WI2 - Wire and Wireless Co.,Ltd. | 1K | 65.5K | 2 |
| AS10209JP | Synopsys-AS-JP-AP - Japan HUB and Data Center | 1K | — | 3 |
| AS131942JP | GURUNAVI-NET - Gurunavi, Inc. | 1K | — | 1 |
| AS55891JP | WBTSJP-AS - WATCH TOWER BIBLE AND TRACT SOCIETY | 1K | 133.6K | 13 |
| AS7660JP | APAN-JP - Asia Pacific Advanced Network - Japan | 1K | 8.4K | 4 |
| AS131940JP | BETANET - Nissho Electronics Corp. | 1K | — | 3 |
| AS131963JP | MCDR-KIX - MC Digital Realty, Inc. | 1K | 65.5K | 2 |
| AS4718JP | CKP - Cyber Kansai Project | 1K | 65.5K | 2 |
| AS18289JP | TAO_TORONTO - AT&T TAO Cloud Access Node | 1K | — | 1 |
| AS151388JP | SE-JIKKEN-AS - SoftEther Corporation (SE-JIKKEN-AS) | 1K | 514 | 8 |
| AS133900JP | GSI-AP - Gilead Sciences, Inc. | 896 | — | 4 |
| AS151380JP | transformedu - Transform Co., Ltd. | 768 | — | 2 |
| AS37888JP | HORIBA-NET - HORIBA, Ltd. | 768 | — | 3 |
| AS146987JP | GMOCL-NET - GMO GlobalSign Holdings K.K. | 768 | — | 3 |
| AS24283JP | MIEDEN-NET - Mieden Co.,Ltd. | 768 | — | 3 |
| AS38074JP | SDCC-AS-AP - SDCC Japan-West Area | 768 | 32.8K | 5 |
| AS63776JP | MERCARI-JP - Mercari, Inc. | 768 | 512 | 4 |
| AS152645JP | FLEXTECHINC-AS-AP - Flextech Inc. | 768 | 65.5K | 4 |
| AS150369JP | Infal - TelHi Corporation | 768 | 65.5K | 4 |
| AS131077JP | TOHMATSU-NET - Deloitte Tohmatsu Group LLC | 768 | — | 3 |
| AS7500JP | M-ROOT-DNS - WIDE Project | 768 | 65.5K | 4 |
| AS59349JP | GMO-Z-COM - GMO-Z.COM PTE. LTD. | 768 | 1 | 3 |
| AS24263JP | HONDA-NET - HONDA MOTOR Co., Ltd. | 768 | — | 3 |
| AS55911JP | kazukichi - kazukichi | 768 | 66.1K | 8 |
| AS59120JP | TINS-NET - Tsukuba Internet Service Corporation | 512 | — | 1 |
| AS133782JP | ELSEVIER-ASIAPACIFIC-AS-AP - Elsevier Ltd | 512 | — | 2 |
| AS55396JP | FNCLAB - NRI SecureTechnologies, Ltd | 512 | — | 2 |
| AS150356JP | GMO-BRS - GMO BRAND SECURITY Inc. | 512 | — | 1 |
| AS153929JP | ABI-AS-AP - Allied Business Inc. | 512 | 256 | 3 |
| AS150366JP | Demae-can-NW - demae-can co. ltd | 512 | — | 2 |
| AS58790JP | TeamFelNull - SERVER-G Group | 512 | 30 | 8 |
| AS151390JP | RUTILEA-A - RUTILEA, Inc. | 512 | — | 1 |
| AS137819JP | BEEKS-AS-AP - Beeks Financial Cloud (Japan) | 512 | — | 2 |
| AS7257JP | MARU-NET OTO GK | 512 | 524.3K | 3 |
| AS63790JP | CA-LAB - CyberAgent, Inc. | 512 | 65.5K | 2 |
| AS63804JP | DOVA-YFM-NET - DOVA Corporation | 512 | — | 1 |
| AS139255JP | U-NEXT-AS-AP - U-NEXT Co.,Ltd. | 512 | — | 2 |
| AS152876JP | COMOTA - Comota Co., Ltd. | 512 | 65.5K | 2 |
| AS24260JP | KINJO-AS - Board of trusty: Kinjo-Gakuen | 512 | — | 1 |
| AS152873JP | NEODY-NET - Neodyland | 512 | 65.5K | 3 |
| AS4777JP | APNIC-COLO - Asia Pacific Network Information Centre | 512 | 16.4K | 4 |
| AS146974JP | WP-NET - Woven by Toyota, Inc. | 512 | 65.5K | 2 |
| AS4717JP | AI3 - WIDE Project | 512 | 81.9K | 4 |
| AS63781JP | KFNET-AS - Kobayashi Family Net LLP | 512 | 65.5K | 3 |