Summary
| ASN | AS19957 AT&T Enterprises, LLC |
| BGP | 66.4.0.0/16 |
| Registry | ARIN |
| Country | US |
| Status | assigned |
| IP Version | IPv4 |
| Allocated | 2000-08-24 |
| Last Updated | 2026-08-26 |
| 66.4.8.0/24 | N/A | 0 | 1 | 1 |
| 66.4.9.0/24 | N/A | 0 | 1 | 1 |
| 66.4.14.0/24 | N/A | 0 | 1 | 1 |
| 66.4.16.0/24 | N/A | 0 | 1 | 1 |
| 66.4.18.0/24 | N/A | 0 | 1 | 2 |
| 66.4.19.0/24 | N/A | 0 | 1 | 1 |
| 66.4.27.0/24 | N/A | 0 | 1 | 1 |
| 66.4.28.0/24 | N/A | 0 | 1 | 1 |
| 66.4.32.0/24 | N/A | 0 | 1 | 1 |
| 66.4.38.0/24 | N/A | 0 | 1 | 1 |
| 66.4.40.0/24 | N/A | 0 | 1 | 1 |
| 66.4.60.0/24 | N/A | 0 | 1 | 1 |
| 66.4.78.0/24 | N/A | 0 | 1 | 1 |
| 66.4.81.0/24 | N/A | 0 | 1 | 1 |
| 66.4.124.0/24 | N/A | 0 | 1 | 1 |
| 66.4.126.0/24 | N/A | 0 | 1 | 1 |