A list of all Japan ASNs including hosting providers, ISPs, and businesses with announced IPv4 and IPv6 prefixes.
| ASN | Type | IPv4 Routes | IPv6 Routes | Company |
|---|---|---|---|---|
| AS59124 | Government | 1 | 0 | KYOTO Prefectural Government |
| AS63777 | Education | 1 | 0 | National Institutes of Natural Sciences National Astronomical Observatory of JAPAN |
| AS63804 | Other Business | 1 | 0 | DOVA Corporation |
| AS9358 | ISP & Mobile | 1 | 0 | OPTAGE Inc. |
| AS945 | Other Business | 1 | 0 | HAONAN YANG |
| AS9593 | Other Business | 1 | 0 | Nikkei Inc. |
| AS9827 | Other Business | 1 | 0 | Agilent Technologies Japan, Ltd |
| AS9935 | ISP & Mobile | 1 | 0 | AT&T Japan K.K. |
| AS9990 | Other Business | 1 | 0 | Nippon Information and Communication |
| AS63778 | Other Business | 0 | 31 | Border Gateway Protocol Network Analysis Project |
| AS134666 | Hosting Provider | 0 | 13 | Cat Networks K.K. |
| AS199436 | Other Business | 0 | 11 | BangLong Yang |
| AS213471 | Other Business | 0 | 11 | YAMAMOTO Hiroshi |
| AS142438 | Other Business | 0 | 5 | Kasumi Networks Inc |
| AS151331 | Other Business | 0 | 4 | Sora You |
| AS201345 | Other Business | 0 | 3 | Shuma Watanabe |
| AS138181 | Hosting Provider | 0 | 2 | Cat Networks K.K. |
| AS140868 | Other Business | 0 | 2 | Ayao Takata |
| AS214430 | Other Business | 0 | 2 | Takahiro Fukushima |
| AS215239 | Other Business | 0 | 2 | Show Corporation |
| AS45681 | Other Business | 0 | 2 | Show Corporation |
| AS135674 | Other Business | 0 | 1 | Kano Network |
| AS150314 | ISP & Mobile | 0 | 1 | Rivulet Networks |
| AS152860 | Other Business | 0 | 1 | GANJINGWORLD K.K. |
| AS199767 | Other Business | 0 | 1 | Pinjia Zhao |
| AS214772 | Other Business | 0 | 1 | CHEN LUOAN |
| AS215871 | Other Business | 0 | 1 | xTom Japan Corporation |
| AS38023 | Other Business | 0 | 1 | Standard Nekomimi |
| AS56218 | Education | 0 | 1 | QGPOP |
| AS9743 | Other Business | 0 | 1 | Nippon EDUIX |