Address space
AS45688 UT-NSRG The University of Tokyo Interfaculty Initiative in Information Studies
IPv4 prefixes
5
3.59K addresses
IPv6 prefixes
0
Most common size
/24
IPv4
Flagged
1
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.
Geography
Where the space lands
| Country | Name | Prefixes |
|---|---|---|
| JP | Japan | 5 |
Review
Flagged prefixes
| Prefix | Family | Addresses | Country | Flags |
|---|---|---|---|---|
| 133.69.167.248/29 | IPv4 | 8 | 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 |
|---|---|---|---|---|
| 133.69.160.0/22 | IPv4 | 1,024 | JP | |
| 133.69.167.248/29 | IPv4 | 8 | JP | Too specific |
| 133.69.168.0/21 | IPv4 | 2,048 | JP | |
| 133.69.176.0/24 | IPv4 | 256 | JP | |
| 133.69.184.0/24 | IPv4 | 256 | JP |