MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ
24 prefixes in 520 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 520-203 | TUCSON | 7465 | 2003-08-13 | Yes |
| 520-284 | TUCSON | 7465 | 2009-03-17 | Yes |
| 520-669 | SIERRAVIST | 7465 | 2023-03-09 | Yes |
| 520-671 | SIERRAVIST | 7465 | 2023-03-09 | Yes |
| 520-672 | SIERRAVIST | 7465 | 2023-03-09 | Yes |
| 520-673 | SIERRAVIST | 7465 | 2023-03-09 | Yes |
| 520-674 | SIERRAVIST | 7465 | 2023-03-09 | Yes |
| 520-684 | SIERRAVIST | 7465 | 2023-08-31 | Yes |
| 520-687 | SIERRAVIST | 7465 | 2023-08-31 | Yes |
| 520-691 | SIERRAVIST | 7465 | 2023-08-31 | Yes |
| 520-692 | SIERRAVIST | 7465 | 2023-08-31 | Yes |
| 520-693 | SIERRAVIST | 7465 | 2023-08-31 | Yes |
| 520-706 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-707 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-708 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-713 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-714 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-715 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-716 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-717 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-718 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-725 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-917 | TUCSON | 7465 | — | — |
| 520-918 | TUCSON | 7465 | — | — |
These are initial assignees from NANPA CO-code records — because of number portability, the current serving carrier of individual numbers may differ. Bulk export requires a membership.