FRONTIER NORTH, INC. - MI
30 prefixes in 517 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 517-238 | COLDWTR LK | 0695 | — | Yes |
| 517-239 | DE WITT | 0695 | 2015-04-23 | Yes |
| 517-263 | ADRIAN | 0695 | — | — |
| 517-264 | ADRIAN | 0695 | — | — |
| 517-265 | ADRIAN | 0695 | — | — |
| 517-266 | ADRIAN | 0695 | — | — |
| 517-278 | COLDWATER | 0695 | — | — |
| 517-279 | COLDWATER | 0695 | — | — |
| 517-283 | READING | 0695 | — | Yes |
| 517-312 | ADRIAN | 0695 | 2015-04-23 | Yes |
| 517-369 | BRONSON | 0695 | — | Yes |
| 517-423 | TECUMSEH | 0695 | — | — |
| 517-424 | TECUMSEH | 0695 | — | Yes |
| 517-431 | TIPTON | 0695 | — | Yes |
| 517-448 | HUDSON | 0695 | — | Yes |
| 517-451 | BRITTON | 0695 | — | Yes |
| 517-456 | CLINTON | 0695 | — | Yes |
| 517-486 | BLISSFIELD | 0695 | — | Yes |
| 517-522 | GRASS LAKE | 0695 | — | Yes |
| 517-622 | GRANDLEDGE | 0695 | — | Yes |
| 517-626 | GRANDLEDGE | 0695 | — | Yes |
| 517-627 | GRANDLEDGE | 0695 | — | — |
| 517-639 | QUINCY | 0695 | — | Yes |
| 517-641 | BATH | 0695 | — | Yes |
| 517-651 | LAINGSBURG | 0695 | — | Yes |
| 517-655 | WILLIAMSTN | 0695 | — | — |
| 517-668 | DE WITT | 0695 | — | Yes |
| 517-669 | DE WITT | 0695 | — | — |
| 517-741 | UNION CITY | 0695 | — | Yes |
| 517-815 | TECUMSEH | 0695 | — | 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.