| ASN | Organization | IPs |
|---|---|---|
| AS2907 | Research Organization of Information and Systems National Institute of Informatics | 45,056 |
| AS63798 | Industrial Cyber Security Center of Excellence | 9,216 |
| AS63770 | Industrial Cyber Security Center of Excellence | 6,144 |
| AS- | - | 4,096 |
| AS37917 | University of Tsukuba | 1,024 |