MCIMETRO ACCESS TRANSMISSION SERVICES LLC
13 prefixes in 857 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 857-227 | SOMERVILLE | 7229 | 2001-05-23 | Yes |
| 857-288 | BOSTON | 7229 | 2006-08-01 | Yes |
| 857-318 | BOSTON | 7229 | 2007-10-17 | Yes |
| 857-353 | BOSTON | 7229 | 2020-01-06 | Yes |
| 857-394 | BELMONT | 7229 | 2021-12-08 | Yes |
| 857-524 | SO BOSTON | 7229 | 2001-03-27 | Yes |
| 857-559 | BRIGHTON | 7229 | 2001-03-27 | Yes |
| 857-588 | CHARLESTN | 7229 | 2001-03-27 | Yes |
| 857-598 | MILTON | 7229 | 2001-03-20 | Yes |
| 857-626 | BELMONT | 7229 | 2001-06-29 | Yes |
| 857-728 | JAMAICA PL | 7229 | 2001-03-27 | Yes |
| 857-816 | WINTHROP | 7229 | 2001-03-20 | Yes |
| 857-996 | BOSTON | 7229 | — | 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.