Address space
AS18087 TOYO Toyo University
IPv4 prefixes
5
65.54K addresses
IPv6 prefixes
5
Most common size
/20
IPv4
Flagged
5
Shape
Prefix sizes
How this network carves its IPv4 space. A wall of /24s usually means many small customer assignments or fine-grained traffic engineering; a few short prefixes means large contiguous allocations announced whole.
Shape
Prefix sizes
Geography
Where the space lands
| Country | Name | Prefixes |
|---|---|---|
| JP | Japan | 10 |
Review
Flagged prefixes
| Prefix | Family | Addresses | Country | Flags |
|---|---|---|---|---|
| 2001:df7:5600::/49 | IPv6 | — | JP | Too specific |
| 2001:df7:5600:8000::/52 | IPv6 | — | JP | Too specific |
| 2001:df7:5600:9000::/52 | IPv6 | — | JP | Too specific |
| 2001:df7:5600:a000::/51 | IPv6 | — | JP | Too specific |
| 2001:df7:5600:c000::/50 | IPv6 | — | JP | Too specific |
A flag is an observation, not an accusation. Very large and very specific prefixes are both legitimate in the right context.
Inventory
All prefixes
| Prefix | Family | Addresses | Country | Flags |
|---|---|---|---|---|
| 133.79.0.0/17 | IPv4 | 32,768 | JP | |
| 133.79.128.0/18 | IPv4 | 16,384 | JP | |
| 133.79.192.0/20 | IPv4 | 4,096 | JP | |
| 133.79.208.0/20 | IPv4 | 4,096 | JP | |
| 133.79.224.0/19 | IPv4 | 8,192 | JP | |
| 2001:df7:5600::/49 | IPv6 | — | JP | Too specific |
| 2001:df7:5600:8000::/52 | IPv6 | — | JP | Too specific |
| 2001:df7:5600:9000::/52 | IPv6 | — | JP | Too specific |
| 2001:df7:5600:a000::/51 | IPv6 | — | JP | Too specific |
| 2001:df7:5600:c000::/50 | IPv6 | — | JP | Too specific |