Address space
AS13979 ATT-IPFR
IPv4 prefixes
5
15.36K addresses
IPv6 prefixes
0
Most common size
/19
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 |
|---|---|---|
| US | United States of America | 5 |
Review
Flagged prefixes
| Prefix | Family | Addresses | Country | Flags |
|---|---|---|---|---|
| 137.164.35.76/30 | IPv4 | 4 | US | 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 |
|---|---|---|---|---|
| 15.12.64.0/21 | IPv4 | 2,048 | US | |
| 15.12.76.0/22 | IPv4 | 1,024 | US | |
| 15.12.80.0/20 | IPv4 | 4,096 | US | |
| 15.12.96.0/19 | IPv4 | 8,192 | US | |
| 137.164.35.76/30 | IPv4 | 4 | US | Too specific |