Address space
AS18087 TOYO Toyo University
Unclassified APNIC
IPv4 prefixes
5
65.54K addresses
IPv6 prefixes
5
Most common size
/20
IPv4
Flagged
5
Shape
IPv4 prefix sizes
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
IPv6 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 | /49 | JP | Too specific |
| 2001:df7:5600:8000::/52 | IPv6 | /52 | JP | Too specific |
| 2001:df7:5600:9000::/52 | IPv6 | /52 | JP | Too specific |
| 2001:df7:5600:a000::/51 | IPv6 | /51 | JP | Too specific |
| 2001:df7:5600:c000::/50 | IPv6 | /50 | JP | Too specific |
A flag is an observation, not an accusation. Very large and very specific prefixes are both legitimate in the right context.