All assignees
639 prefixes in 517 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 517-300 | ONSTED | 543C | 2019-10-10 | Yes |
| 517-301 | TECUMSEH | 6534 | — | Yes |
| 517-302 | FOWLERVL | 2964 | 2021-10-15 | Yes |
| 517-303 | LANSING | 2964 | 2001-10-01 | Yes |
| 517-304 | HOWELL | 6534 | — | — |
| 517-305 | CLARKLAKE | 6120 | 2008-09-16 | Yes |
| 517-306 | HUDSON | 6534 | — | Yes |
| 517-307 | JACKSON | 6534 | 2025-10-06 | Yes |
| 517-308 | DIMONDALE | 7157 | — | Yes |
| 517-309 | COLDWATER | 6630 | — | — |
| 517-310 | MULLIKEN | 516C | 2023-08-29 | Yes |
| 517-311 | XXXXXXXXXX | MULT | — | — |
| 517-312 | ADRIAN | 0695 | 2015-04-23 | Yes |
| 517-313 | — | — | ||
| 517-314 | JACKSON | 732J | 2023-03-03 | Yes |
| 517-315 | JACKSON | 6534 | — | Yes |
| 517-316 | LANSING | 9323 | — | Yes |
| 517-317 | COLDWATER | 6534 | — | Yes |
| 517-318 | LANSING | 7157 | — | Yes |
| 517-319 | LANSING | 7157 | — | Yes |
| 517-320 | HILLSDALE | 6003 | — | — |
| 517-321 | LANSING | 9323 | — | — |
| 517-322 | LANSING | 9323 | — | — |
| 517-323 | LANSING | 9323 | — | — |
| 517-324 | LANSING | 9323 | — | — |
| 517-325 | LANSING | 9323 | — | Yes |
| 517-326 | LANSING | 490J | 2021-12-14 | Yes |
| 517-327 | LANSING | 9323 | — | — |
| 517-328 | LANSING | 515J | 2021-01-28 | Yes |
| 517-329 | LANSING | 597F | 2019-06-17 | Yes |
| 517-330 | LITCHFIELD | 817J | 2004-12-06 | — |
| 517-331 | LANSING | 6003 | — | Yes |
| 517-332 | LANSING | 9323 | — | — |
| 517-333 | LANSING | 9323 | — | — |
| 517-334 | LANSING | 9323 | — | Yes |
| 517-335 | LANSING | 9323 | — | — |
| 517-336 | LANSING | 9323 | — | Yes |
| 517-337 | LANSING | 9323 | — | — |
| 517-338 | HOWELL | 7279 | — | Yes |
| 517-339 | LANSING | 9323 | — | — |
| 517-340 | LANSING | 6630 | — | — |
| 517-341 | LANSING | 6630 | — | — |
| 517-342 | LANSING | 9323 | — | Yes |
| 517-343 | ALBION | 961J | 2012-04-03 | Yes |
| 517-344 | JACKSON | 478J | 2021-12-21 | Yes |
| 517-345 | DIMONDALE | 7157 | 2005-03-16 | Yes |
| 517-346 | LANSING | 9323 | — | — |
| 517-347 | LANSING | 9323 | — | — |
| 517-348 | LANSING | 543C | 2009-02-06 | Yes |
| 517-349 | LANSING | 9323 | — | — |
| 517-350 | LANSING | 321J | 2023-03-10 | Yes |
| 517-351 | LANSING | 9323 | — | — |
| 517-352 | BATH | 543C | 2023-07-05 | Yes |
| 517-353 | LANSING | 9323 | — | — |
| 517-354 | LAINGSBURG | 543C | 2023-07-05 | Yes |
| 517-355 | LANSING | 9323 | — | — |
| 517-356 | LANSING | 965H | 2019-11-22 | Yes |
| 517-357 | CAMBRIA | 4417 | — | — |
| 517-358 | JACKSON | 2964 | — | Yes |
| 517-359 | STOCKBDG | 543C | 2023-07-05 | Yes |
| 517-360 | LANSING | 9748 | — | — |
| 517-361 | NASHVILLE | 991E | 2025-11-20 | Yes |
| 517-362 | MASON | 2964 | 2024-02-21 | Yes |
| 517-363 | LANSING | 9323 | — | — |
| 517-364 | LANSING | 9323 | — | — |
| 517-365 | WEBBERVL | 543C | 2023-07-05 | Yes |
| 517-366 | ADRIAN | 2964 | 2010-04-02 | Yes |
| 517-367 | LANSING | 9323 | — | — |
| 517-368 | CAMDEN | 4417 | — | — |
| 517-369 | BRONSON | 0695 | — | Yes |
| 517-370 | MONTGOMERY | 543C | 2023-07-05 | Yes |
| 517-371 | LANSING | 9323 | — | — |
| 517-372 | LANSING | 9323 | — | — |
| 517-373 | LANSING | 9323 | — | — |
| 517-374 | LANSING | 9323 | — | — |
| 517-375 | FOWLERVL | 6003 | 2002-10-24 | — |
| 517-376 | HOWELL | 318J | — | Yes |
| 517-377 | LANSING | 9323 | — | Yes |
| 517-378 | POTTERVL | 6534 | 2021-10-04 | Yes |
| 517-379 | BUNDY HILL | 991E | 2024-08-20 | Yes |
| 517-380 | HOWELL | 2964 | 2024-01-17 | Yes |
| 517-381 | LANSING | 9323 | — | — |
| 517-382 | LESLIE | 318J | 2024-09-16 | Yes |
| 517-383 | PRATTVILLE | 4417 | — | — |
| 517-384 | CHARLOTTE | 6534 | 2024-10-23 | Yes |
| 517-385 | LANSING | 700J | 2026-01-29 | Yes |
| 517-386 | EATON RPD | 7157 | 2004-03-05 | Yes |
| 517-387 | HILLSDALE | 6534 | 2026-04-27 | Yes |
| 517-388 | LANSING | 6003 | — | Yes |
| 517-389 | ADRIAN | 6534 | 2026-06-24 | Yes |
| 517-390 | JACKSON | 9748 | — | — |
| 517-391 | LANSING | 2964 | — | Yes |
| 517-392 | JACKSON | 2964 | — | Yes |
| 517-393 | LANSING | 9323 | — | — |
| 517-394 | LANSING | 9323 | — | — |
| 517-395 | JACKSON | 6003 | 2009-12-08 | Yes |
| 517-396 | JACKSON | 6003 | 2026-08-28 | Yes |
| 517-398 | HILLSDALE | 6534 | — | Yes |
| 517-399 | EATON RPD | 516J | 2022-02-22 | Yes |
| 517-400 | LANSING | 624H | 2019-10-29 | 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.