Address space
AS4237 CSC-IGN-FTW-AS4237
IPv4 prefixes
10
48.64K addresses
IPv6 prefixes
0
Most common size
/20
IPv4
Flagged
0
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 |
|---|---|---|
| US | United States of America | 10 |
Inventory
All prefixes
| Prefix | Family | Addresses | Country | Flags |
|---|---|---|---|---|
| 20.137.0.0/21 | IPv4 | 2,048 | US | |
| 20.137.12.0/22 | IPv4 | 1,024 | US | |
| 20.137.176.0/20 | IPv4 | 4,096 | US | |
| 20.137.216.0/24 | IPv4 | 256 | US | |
| 20.137.240.0/20 | IPv4 | 4,096 | US | |
| 20.148.32.0/19 | IPv4 | 8,192 | US | |
| 20.148.96.0/19 | IPv4 | 8,192 | US | |
| 20.148.128.0/18 | IPv4 | 16,384 | US | |
| 20.148.240.0/20 | IPv4 | 4,096 | US | |
| 20.156.169.0/24 | IPv4 | 256 | US |