Address space
AS257 DNIC-AS-00257
Unclassified ARIN
IPv4 prefixes
8
716 addresses
IPv6 prefixes
5
Most common size
/24
IPv4
Flagged
10
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 |
|---|---|---|
| US | United States of America | 13 |
Review
Flagged prefixes
| Prefix | Family | Addresses | Country | Flags |
|---|---|---|---|---|
| 137.164.24.188/31 | IPv4 | 2 | US | Too specific |
| 137.164.50.148/30 | IPv4 | 4 | US | Too specific |
| 137.164.50.252/30 | IPv4 | 4 | US | Too specific |
| 204.102.228.128/25 | IPv4 | 128 | US | Too specific |
| 204.102.230.112/31 | IPv4 | 2 | US | Too specific |
| 209.129.248.192/26 | IPv4 | 64 | US | Too specific |
| 2607:f380:1::108:9a41:8bc0/123 | IPv6 | /123 | US | Too specific |
| 2607:f380:1::118:9a43:2940/122 | IPv6 | /122 | US | Too specific |
| 2607:f380:1::118:9a43:2fc0/122 | IPv6 | /122 | US | Too specific |
| 2607:f380:1::11c:c66e:6700/123 | IPv6 | /123 | US | Too specific |
A flag is an observation, not an accusation. Very large and very specific prefixes are both legitimate in the right context.