Address space
AS2523 ITRC-NET Internet Technology Research Consortium
IPv4 prefixes
18
61.94K addresses
IPv6 prefixes
1
Most common size
/23
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 | 19 |
Review
Flagged prefixes
| Prefix | Family | Addresses | Country | Flags |
|---|---|---|---|---|
| 133.69.167.0/25 | IPv4 | 128 | JP | Too specific |
| 133.69.167.128/26 | IPv4 | 64 | JP | Too specific |
| 133.69.167.192/27 | IPv4 | 32 | JP | Too specific |
| 133.69.167.224/28 | IPv4 | 16 | JP | Too specific |
| 133.69.167.240/29 | 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 |
|---|---|---|---|---|
| 133.69.0.0/17 | IPv4 | 32,768 | JP | |
| 133.69.128.0/19 | IPv4 | 8,192 | JP | |
| 133.69.164.0/23 | IPv4 | 512 | JP | |
| 133.69.166.0/24 | IPv4 | 256 | JP | |
| 133.69.167.0/25 | IPv4 | 128 | JP | Too specific |
| 133.69.167.128/26 | IPv4 | 64 | JP | Too specific |
| 133.69.167.192/27 | IPv4 | 32 | JP | Too specific |
| 133.69.167.224/28 | IPv4 | 16 | JP | Too specific |
| 133.69.167.240/29 | IPv4 | 8 | JP | Too specific |
| 133.69.177.0/24 | IPv4 | 256 | JP | |
| 133.69.178.0/23 | IPv4 | 512 | JP | |
| 133.69.180.0/22 | IPv4 | 1,024 | JP | |
| 133.69.185.0/24 | IPv4 | 256 | JP | |
| 133.69.186.0/23 | IPv4 | 512 | JP | |
| 133.69.188.0/22 | IPv4 | 1,024 | JP | |
| 133.69.192.0/20 | IPv4 | 4,096 | JP | |
| 133.69.208.0/20 | IPv4 | 4,096 | JP | |
| 133.69.224.0/19 | IPv4 | 8,192 | JP | |
| 2407:e0c0::/32 | IPv6 | — | JP |