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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 |
| — |
| 3 |
| AS59097JP | OCH-NET - Okinawa Cross Head Co., Ltd. | 1K | — | 3 |
| AS138033JP | BBIX-AS-AP - BBIX, Inc | 1K | 65.5K | 5 |
| AS58645JP | marinet - Miyagi Cable TV Co.,Ltd | 1K | 65.5K | 2 |
| AS55393JP | MIDOKURA - Midokura Japan K.K. | 1K | — | 4 |
| AS55569JP | CRITEO-AS-AP - Criteo APAC | 1K | 8 | 12 |
| AS131945JP | SNTU-NET - Sanntuu Corporation | 1K | — | 1 |
| AS131963JP | MCDR-KIX - MC Digital Realty, Inc. | 1K | 65.5K | 2 |
| AS131905JP | JPRS-GTLD - Japan Registry Services Co., Ltd. | 1K | 65.5K | 4 |
| AS10209JP | Synopsys-AS-JP-AP - Japan HUB and Data Center | 1K | — | 3 |
| AS18289JP | TAO_TORONTO - AT&T TAO Cloud Access Node | 1K | — | 1 |
| AS23799JP | NDA - National Defense Academy | 1K | — | 4 |
| AS37900JP | MATSURI - NTT DOCOMO BUSINESS, Inc. | 1K | 3 | 7 |
| AS37904JP | BBIX-NETWORK - BBIX, Inc. | 1.3K | 1 | 4 |
| AS146979JP | SUNDAICHI - University of Nagasaki | 1.3K | 1 | 6 |
| AS131900JP | DIRECTORZ - Directorz Co.,Ltd. | 1.3K | 1 | 5 |
| AS7674JP | GOFORS - NTT DOCOMO BUSINESS, Inc | 1.3K | 1 | 4 |
| AS18072JP | STREAMWING - NTT DOCOMO BUSINESS, Inc. | 1.3K | — | 5 |
| AS63801JP | DODO-NET - DODO K.K. | 1.3K | — | 4 |
| AS7667JP | KDDLAB - KDDI Research, Inc. | 1.3K | 65 | 4 |
| AS131912JP | CYBOZU - Cybozu,Inc. | 1.3K | 65.5K | 3 |
| AS142165JP | BOSCHCORPORATION-AS-AP - Bosch Corporation | 1.3K | 65.5K | 5 |
| AS63773JP | DUAL-NET - dual&Co. Inc. | 1.3K | 65.5K | 4 |
| AS59129JP | LOGICLINKS - LogicLinks, Inc. | 1.3K | — | 3 |
| AS131917JP | TOSHIBA-IS - Toshiba I.S. corp | 1.3K | — | 5 |
| AS152868JP | THX-NET - THX Corp. | 1.3K | — | 4 |
| AS24291JP | MITSUI-NW - MITSUI & CO., LTD. | 1.3K | — | 4 |
| AS133203JP | SBIBITS-JP - SBI BITS Co., Ltd. | 1.5K | — | 5 |
| AS18258JP | MS-JP-AS-AP - Morgan Stanley Japan Limited | 1.5K | — | 6 |
| AS63789JP | NEXT-WEB - NeXtWEB Corporation | 1.5K | — | 3 |
| AS131982JP | UBC - Uenohara Broadband Communications Inc. | 1.5K | 65.5K | 3 |
| AS37893JP | TRADEWEB-TKO - Tradeweb Japan | 1.5K | — | 5 |
| AS7527JP | JPIX - Japan Internet Xing Co., Ltd. | 1.5K | 65.5K | 3 |
| AS24257JP | JPIX-64ES - Japan Internet Xing Co., Ltd. | 1.5K | 3 | 8 |
| AS54415JP | WIZ-JP-AS-AP - WIZ K.K. | 1.5K | 7 | 13 |
| AS131910JP | SORACOM - SORACOM. INC. | 1.5K | 65.5K | 4 |
| AS24280JP | HIS-TKIDC - Hitachi Systems, Ltd. | 1.5K | — | 2 |
| AS150367JP | CLOUD-NET - Future Corp. | 1.5K | — | 6 |
| AS51044JP | RHE Kazuki Yamaguchi | 1.5K | 131.1K | 21 |
| AS18123JP | SEIRYO - INAOKI EDUCATIONAL INSTITUTION | 1.5K | 1 | 3 |
| AS131966JP | INET-NET - I-NET CORP. | 1.5K | — | 2 |
| AS55888JP | Nintatsu - Nintatsu Global Telecommunications Corporation | 1.7K | — | 6 |
| AS131904JP | CYBERFEELINC-JP - Cyber Feel Inc. | 1.8K | — | 6 |
| AS141757JP | ZJC-AS-AP - Zoho Japan Corporation | 1.8K | 2 | 7 |
| AS131914JP | DD-NET - Rakuten Group, Inc. | 1.8K | — | 5 |
| AS37889JP | JPARC-NET - J-PARC Center | 1.8K | — | 3 |
| AS139358JP | KANSUIUN-AS-AP - Kansuiun Co., Ltd | 1.8K | 273 | 10 |