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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 |
| AS63795JP | ROUTEL - RoutelNet | — | — | 0 |
| AS131073JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS151039JP | TAO_MONTERREY - AT&T TAO Cloud Access Node | — | — | 0 |
| AS24056JP | SINGTEL-EXPAN-JP - Internet Data Centre | — | — | 0 |
| AS37903JP | AS37903-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18073JP | AS18073-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17933JP | NTT-EAST - Nippon Telegraph and Telephone East Corporation | — | — | 0 |
| AS17525JP | AS17525-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9592JP | PRISM - SOFTBANK TELECOM Corp. | — | — | 0 |
| AS63807JP | AS63807-38 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS135573JP | MBC-AS-AP - mediatti broadband communications | — | — | 0 |
| AS151030JP | TAO_LOS_ANGLELES1 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151013JP | TAO_LONDON - AT&T TAO Cloud Access Node | — | — | 0 |
| AS137508JP | JP-RAINBOW-20180312 Toko Communications Co., Ltd. | — | — | 0 |
| AS18275JP | AS18275-17 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131980JP | KINIKUNET - KADOKAWA CORPORATION | — | — | 0 |
| AS151028JP | TAO_SYDNEY_LAB - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151029JP | TAO_MIAMI1 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151015JP | TAO_FRANKFURT - AT&T TAO Cloud Access Node | — | — | 0 |
| AS4684JP | NTTPC - NTT PC Communications, Inc. | — | — | 0 |
| AS2520JP | AS2520-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS63796JP | AS63796-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS140701JP | IDCLEGEND-AS-AP - IDC Legend Corp. | — | — | 0 |
| AS7666JP | OKIX-1 - Mitsubishi Corporation | — | — | 0 |
| AS2524JP | RIM - EJWORKS CORPORATION | — | — | 0 |
| AS131920JP | closip-2 - closip Inc. | — | — | 0 |
| AS4699JP | AS4699-17 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9368JP | AS9368-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS10005JP | AS10005-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS59130JP | MHDD-NET - NTT DOCOMO BUSINESS, Inc. | — | — | 0 |
| AS46953JP | INCLEAF - FENGYE INC | — | — | 0 |
| AS45676JP | AS45676-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24252JP | JPRS-NAYUTA - Japan Registry Service Co., Ltd. | 256 | 65.5K | 2 |
| AS63800JP | SERVER-G - SERVER-G Group | 256 | 10 | 11 |
| AS9609JP | BBIX-CDN - BBIX, Inc. | 256 | 1 | 2 |
| AS63780JP | BIRDIE-NET - dual&Co. Inc. | 256 | 16.4K | 2 |
| AS45678JP | AAC-JP-AS - ABN AMRO Clearing Tokyo Co., Ltd. | 256 | — | 1 |
| AS59106JP | INET6 - Cyber and Internet Association | 256 | 65.5K | 2 |
| AS37905JP | BRASTEL-NET - Brastel Co.,Ltd | 256 | — | 1 |
| AS146972JP | TEC-JP-NET - TOYO Engineering Corporation | 256 | 1 | 2 |
| AS24287JP | TEIN2-JP - National Institute of Informatics | 256 | 1 | 2 |
| AS151378JP | CSAISON-NET - Credit SAISON Co., Ltd. | 256 | — | 1 |
| AS131924JP | KAP-NET - Kansai Airports | 256 | 1 | 2 |
| AS58649JP | GMO-REG-R1 - GMO Internet, Inc. | 256 | 1 | 2 |
| AS151376JP | SHR-TYO-NET - Solare Hotels and Resorts Co., Ltd. | 256 | — | 1 |
| AS945JP | JP-77-20220621 HAONAN YANG | 256 | — | 1 |