All assignees
570 prefixes in 586 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 586-300 | MT CLEMENS | 965H | 2019-12-19 | Yes |
| 586-301 | WARREN | 490J | 2021-12-21 | Yes |
| 586-302 | MT CLEMENS | 6534 | 2023-01-18 | Yes |
| 586-303 | WARREN | 543C | — | Yes |
| 586-304 | NEW HAVEN | 543C | 2021-06-25 | Yes |
| 586-305 | MT CLEMENS | 6534 | 2016-11-08 | Yes |
| 586-306 | WARREN | 6534 | — | — |
| 586-307 | MT CLEMENS | 9323 | — | Yes |
| 586-308 | ROSEVILLE | 9748 | — | — |
| 586-309 | ROSEVILLE | 9748 | — | — |
| 586-310 | MT CLEMENS | 770E | 2021-12-23 | Yes |
| 586-311 | XXXXXXXXXX | MULT | — | — |
| 586-312 | MT CLEMENS | 6003 | 2015-01-13 | Yes |
| 586-313 | — | — | ||
| 586-314 | UTICA | 7279 | — | Yes |
| 586-315 | NEW HAVEN | 991E | 2012-06-12 | Yes |
| 586-316 | WARREN | 770E | 2021-08-26 | Yes |
| 586-317 | RICHMOND | 817J | — | — |
| 586-318 | ROMEO | 6003 | 2022-05-23 | Yes |
| 586-319 | WARREN | 9748 | — | — |
| 586-320 | MT CLEMENS | 6003 | 2014-05-16 | Yes |
| 586-321 | MT CLEMENS | 6534 | — | — |
| 586-322 | MT CLEMENS | 6534 | — | — |
| 586-323 | UTICA | 9323 | — | — |
| 586-324 | MT CLEMENS | 6003 | 2013-08-28 | Yes |
| 586-325 | NEWBALTIMR | 543C | 2021-07-20 | Yes |
| 586-326 | RICHMOND | 543C | 2021-10-29 | Yes |
| 586-327 | ROSEVILLE | 543C | — | Yes |
| 586-328 | WARREN | 2964 | 2021-12-23 | Yes |
| 586-329 | MT CLEMENS | 5562 | 2006-10-10 | Yes |
| 586-330 | NEWBALTIMR | 770E | — | Yes |
| 586-331 | ROMEO | 770E | — | Yes |
| 586-332 | MT CLEMENS | 6003 | 2013-01-16 | Yes |
| 586-333 | MT CLEMENS | 543C | 2015-07-23 | Yes |
| 586-334 | ROSEVILLE | 543C | 2021-07-30 | Yes |
| 586-335 | ROSEVILLE | 6003 | 2010-07-12 | Yes |
| 586-336 | ROMEO | 9323 | — | Yes |
| 586-337 | ROMEO | 6534 | — | Yes |
| 586-338 | MT CLEMENS | 6003 | 2015-09-02 | Yes |
| 586-339 | NEW HAVEN | 5562 | — | Yes |
| 586-340 | CENTERLINE | 6534 | 2023-03-07 | Yes |
| 586-341 | ROMEO | 6003 | 2023-07-20 | Yes |
| 586-342 | MT CLEMENS | 6003 | 2013-09-13 | Yes |
| 586-343 | ROSEVILLE | 2964 | 2012-07-13 | Yes |
| 586-344 | WARREN | 2964 | — | — |
| 586-345 | MT CLEMENS | 965H | 2021-08-17 | Yes |
| 586-346 | UTICA | 2964 | 2024-02-21 | Yes |
| 586-347 | ROSEVILLE | 2964 | 2024-05-15 | Yes |
| 586-348 | MT CLEMENS | 6003 | 2013-09-26 | Yes |
| 586-349 | MT CLEMENS | 817J | — | — |
| 586-350 | ROSEVILLE | 5562 | — | Yes |
| 586-351 | ROSEVILLE | 2964 | 2024-04-12 | Yes |
| 586-352 | MT CLEMENS | 543C | 2023-06-02 | Yes |
| 586-353 | CENTERLINE | 829J | — | Yes |
| 586-354 | WARREN | 2550 | — | Yes |
| 586-355 | RICHMOND | 543C | 2021-01-06 | Yes |
| 586-356 | ARMADA | 2964 | 2024-06-12 | Yes |
| 586-357 | MT CLEMENS | 6003 | 2015-07-16 | Yes |
| 586-358 | UTICA | 624H | 2023-02-21 | Yes |
| 586-359 | ROSEVILLE | 6003 | 2011-07-15 | Yes |
| 586-360 | ROSEVILLE | 5562 | — | Yes |
| 586-361 | ROMEO | 6630 | — | — |
| 586-362 | ROSEVILLE | 5562 | — | Yes |
| 586-363 | MT CLEMENS | 6630 | — | — |
| 586-364 | ROSEVILLE | 6534 | 2025-06-09 | Yes |
| 586-365 | WARREN | 829J | 2001-02-15 | Yes |
| 586-366 | ARMADA | 543C | 2021-05-19 | Yes |
| 586-367 | CENTERLINE | 6534 | 2025-06-11 | Yes |
| 586-368 | WARREN | 543C | 2023-06-22 | Yes |
| 586-369 | ARMADA | 2964 | 2025-09-24 | Yes |
| 586-371 | WASHINGTON | 543C | 2016-03-14 | Yes |
| 586-372 | ROMEO | 2964 | — | Yes |
| 586-375 | MT CLEMENS | 6003 | 2015-07-16 | Yes |
| 586-377 | WARREN | 6003 | 2016-02-10 | Yes |
| 586-379 | ARMADA | 2964 | 2026-05-29 | Yes |
| 586-380 | ROMEO | 9748 | — | — |
| 586-381 | WARREN | 6534 | — | Yes |
| 586-382 | WARREN | 6534 | — | Yes |
| 586-383 | WARREN | 6534 | — | Yes |
| 586-385 | MT CLEMENS | 6003 | 2014-10-17 | Yes |
| 586-386 | MT CLEMENS | 6003 | 2015-08-27 | Yes |
| 586-388 | MT CLEMENS | 6003 | 2013-08-14 | Yes |
| 586-389 | MT CLEMENS | 6003 | 2014-10-09 | Yes |
| 586-392 | MT CLEMENS | 6003 | 2014-12-12 | Yes |
| 586-393 | CENTERLINE | 516C | — | Yes |
| 586-395 | MT CLEMENS | 6003 | 2014-10-17 | Yes |
| 586-396 | MT CLEMENS | 6003 | 2016-02-26 | Yes |
| 586-399 | MT CLEMENS | 6003 | 2014-10-09 | Yes |
| 586-400 | ROMEO | 965H | 2019-12-19 | Yes |
| 586-402 | WARREN | 9748 | — | — |
| 586-403 | MT CLEMENS | 6630 | — | — |
| 586-404 | ROSEVILLE | 5562 | 2009-12-16 | Yes |
| 586-405 | MT CLEMENS | 2964 | — | Yes |
| 586-406 | WARREN | 9748 | — | — |
| 586-408 | MT CLEMENS | 817J | — | — |
| 586-409 | MT CLEMENS | 6630 | — | — |
| 586-411 | XXXXXXXXXX | MULT | — | — |
| 586-412 | MT CLEMENS | 9323 | — | — |
| 586-413 | WARREN | 6534 | — | Yes |
| 586-414 | MT CLEMENS | 6003 | 2015-09-02 | 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.