MICHIGAN BELL TEL CO
244 prefixes in 313 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 313-206 | DETROITZN6 | 9323 | — | — |
| 313-221 | DETROITZN1 | 9323 | 2005-06-17 | Yes |
| 313-222 | DETROITZN1 | 9323 | — | — |
| 313-223 | DETROITZN1 | 9323 | — | — |
| 313-224 | DETROITZN1 | 9323 | — | — |
| 313-225 | DETROITZN1 | 9323 | — | — |
| 313-226 | DETROITZN1 | 9323 | — | — |
| 313-227 | DETROITZN1 | 9323 | — | — |
| 313-232 | DETROITZN5 | 9323 | — | — |
| 313-233 | DETROITZN5 | 9323 | — | — |
| 313-234 | DETROITZN1 | 9323 | — | Yes |
| 313-235 | DETROITZN1 | 9323 | — | — |
| 313-237 | DETROITZN1 | 9323 | — | — |
| 313-240 | DETROITZN6 | 9323 | — | Yes |
| 313-245 | DETROITZN2 | 9323 | — | — |
| 313-248 | DETROITZN6 | 9323 | — | — |
| 313-249 | DETROITZN5 | 9323 | — | — |
| 313-252 | DETROITZN3 | 9323 | — | — |
| 313-253 | DETROITZN6 | 9323 | — | Yes |
| 313-255 | DETROITZN5 | 9323 | — | — |
| 313-256 | DETROITZN1 | 9323 | — | Yes |
| 313-259 | DETROITZN1 | 9323 | — | — |
| 313-267 | DETROITZN2 | 9323 | — | — |
| 313-270 | DETROITZN4 | 9323 | — | Yes |
| 313-271 | DETROITZN6 | 9323 | — | — |
| 313-272 | DETROITZN4 | 9323 | — | — |
| 313-273 | DETROITZN4 | 9323 | — | — |
| 313-274 | DETROITZN6 | 9323 | — | — |
| 313-275 | DETROITZN5 | 9323 | — | — |
| 313-277 | DETROITZN6 | 9323 | — | Yes |
| 313-278 | DETROITZN6 | 9323 | — | — |
| 313-291 | DETROITZN6 | 9323 | — | — |
| 313-292 | DETROITZN6 | 9323 | — | — |
| 313-294 | DETROITZN6 | 9323 | — | Yes |
| 313-295 | DETROITZN6 | 9323 | — | — |
| 313-297 | DETROITZN6 | 9323 | — | — |
| 313-298 | DETROITZN1 | 9323 | — | — |
| 313-299 | DETROITZN6 | 9323 | — | Yes |
| 313-302 | DETROITZN5 | 9323 | — | — |
| 313-317 | DETROITZN6 | 9323 | — | — |
| 313-322 | DETROITZN6 | 9323 | — | — |
| 313-323 | DETROITZN6 | 9323 | — | — |
| 313-331 | DETROITZN2 | 9323 | — | Yes |
| 313-335 | DETROITZN1 | 9323 | — | Yes |
| 313-336 | DETROITZN6 | 9323 | — | — |
| 313-337 | DETROITZN6 | 9323 | — | — |
| 313-338 | DETROITZN1 | 9323 | 2011-10-11 | Yes |
| 313-340 | DETROITZN4 | 9323 | — | Yes |
| 313-341 | DETROITZN4 | 9323 | — | — |
| 313-342 | DETROITZN4 | 9323 | — | — |
| 313-343 | DETROITZN2 | 9323 | — | Yes |
| 313-345 | DETROITZN4 | 9323 | — | — |
| 313-359 | DETROITZN6 | 9323 | — | Yes |
| 313-361 | DETROITZN1 | 9323 | — | — |
| 313-365 | DETROITZN3 | 9323 | — | Yes |
| 313-366 | DETROITZN3 | 9323 | — | — |
| 313-368 | DETROITZN3 | 9323 | — | — |
| 313-369 | DETROITZN3 | 9323 | — | — |
| 313-371 | DETROITZN2 | 9323 | — | — |
| 313-372 | DETROITZN2 | 9323 | — | — |
| 313-373 | DETROITZN1 | 9323 | 2009-10-06 | Yes |
| 313-375 | DETROITZN6 | 9323 | — | Yes |
| 313-381 | DETROITZN6 | 9323 | — | — |
| 313-382 | DETROITZN6 | 9323 | — | — |
| 313-383 | DETROITZN6 | 9323 | — | — |
| 313-386 | DETROITZN6 | 9323 | — | — |
| 313-387 | DETROITZN5 | 9323 | — | — |
| 313-388 | DETROITZN6 | 9323 | — | — |
| 313-389 | DETROITZN6 | 9323 | — | Yes |
| 313-390 | DETROITZN6 | 9323 | — | — |
| 313-392 | DETROITZN1 | 9323 | — | Yes |
| 313-393 | DETROITZN1 | 9323 | — | — |
| 313-394 | DETROITZN1 | 9323 | — | Yes |
| 313-396 | DETROITZN1 | 9323 | — | — |
| 313-417 | DETROITZN2 | 9323 | — | Yes |
| 313-425 | DETROITZN6 | 9323 | — | Yes |
| 313-436 | DETROITZN6 | 9323 | — | Yes |
| 313-438 | DETROITZN6 | 9323 | — | Yes |
| 313-441 | DETROITZN6 | 9323 | — | — |
| 313-442 | DETROITZN1 | 9323 | — | Yes |
| 313-446 | DETROITZN1 | 9323 | — | Yes |
| 313-448 | DETROITZN1 | 9323 | 2010-12-09 | Yes |
| 313-456 | DETROITZN1 | 9323 | — | Yes |
| 313-471 | DETROITZN1 | 9323 | — | Yes |
| 313-473 | DETROITZN2 | 9323 | 2008-08-06 | Yes |
| 313-482 | DETROITZN1 | 9323 | 2008-10-09 | Yes |
| 313-491 | DETROITZN4 | 9323 | — | Yes |
| 313-493 | DETROITZN4 | 9323 | — | Yes |
| 313-494 | DETROITZN1 | 9323 | — | — |
| 313-496 | DETROITZN1 | 9323 | — | — |
| 313-499 | DETROITZN2 | 9323 | — | Yes |
| 313-507 | DETROITZN5 | 9323 | — | — |
| 313-508 | DETROITZN5 | 9323 | — | — |
| 313-521 | DETROITZN2 | 9323 | — | — |
| 313-526 | DETROITZN2 | 9323 | — | — |
| 313-527 | DETROITZN2 | 9323 | — | — |
| 313-531 | DETROITZN5 | 9323 | — | — |
| 313-532 | DETROITZN5 | 9323 | — | — |
| 313-533 | DETROITZN5 | 9323 | — | — |
| 313-534 | DETROITZN5 | 9323 | — | — |
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.