MCIMETRO ACCESS TRANSMISSION SERVICES LLC
13 prefixes in 623 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 623-201 | PHOENIX | 7229 | 2008-07-11 | Yes |
| 623-218 | PHOENIX | 7229 | — | Yes |
| 623-240 | PHOENIX | 7229 | 2009-06-15 | Yes |
| 623-282 | PHOENIX | 7229 | 2011-10-04 | Yes |
| 623-298 | PHOENIX | 7229 | — | Yes |
| 623-299 | PHOENIX | 7229 | 2012-05-03 | Yes |
| 623-476 | PHOENIX | 7229 | — | Yes |
| 623-499 | PHOENIX | 7229 | 2015-06-15 | Yes |
| 623-518 | PHOENIX | 7229 | — | Yes |
| 623-687 | PHOENIX | 7229 | — | Yes |
| 623-734 | PHOENIX | 7229 | — | Yes |
| 623-745 | PHOENIX | 7229 | 2015-09-28 | Yes |
| 623-759 | PHOENIX | 7229 | 2015-02-11 | Yes |
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.