All assignees
647 prefixes in 928 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 928-501 | LKPLEASANT | 2191 | — | — |
| 928-502 | YUMA | 6010 | 2001-12-18 | Yes |
| 928-503 | YUMA | 6572 | — | Yes |
| 928-504 | SOMERTON | 630E | — | — |
| 928-505 | LKHAVASUCY | 2172 | — | — |
| 928-506 | PIMA | 630E | 2023-06-26 | Yes |
| 928-507 | MARBLECNYN | 630E | 2023-06-26 | Yes |
| 928-508 | YUMA | 630E | 2023-08-31 | Yes |
| 928-509 | YUMA | 6572 | 2023-09-18 | Yes |
| 928-510 | SOMERTON | 6572 | 2023-09-19 | Yes |
| 928-511 | XXXXXXXXXX | MULT | — | — |
| 928-512 | SOMERTON | 907K | 2023-09-20 | Yes |
| 928-513 | CLIFTON | 6572 | 2023-09-29 | Yes |
| 928-514 | BULLHEADCY | 6529 | 2010-07-23 | Yes |
| 928-515 | PRESCOTT | 9636 | 2009-11-05 | Yes |
| 928-516 | MOHAVE VLY | 6572 | 2023-10-02 | Yes |
| 928-517 | PAYSON | 6010 | — | Yes |
| 928-518 | SEDONA | 6529 | 2024-02-07 | Yes |
| 928-519 | MOHAVE VLY | 630E | 2020-12-23 | Yes |
| 928-521 | SHOW LOW | 4146 | — | — |
| 928-522 | FLAGSTAFF | 9636 | — | Yes |
| 928-523 | FLAGSTAFF | 9636 | — | — |
| 928-524 | HOLBROOK | 4426 | — | Yes |
| 928-525 | FLAGSTAFF | 9636 | — | Yes |
| 928-526 | FLAGSTAFF | 9636 | — | — |
| 928-527 | FLAGSTAFF | 9636 | — | — |
| 928-528 | SHOW LOW | 4146 | — | — |
| 928-529 | KINGMAN | 612K | 2014-02-06 | Yes |
| 928-530 | KINGMAN | 6010 | — | — |
| 928-531 | PRESCOTT | 6572 | 2024-02-16 | Yes |
| 928-532 | SHOW LOW | 4426 | — | — |
| 928-533 | PRESCOTT | 6529 | 2002-04-17 | Yes |
| 928-534 | SAFFORD | 516J | 2022-02-17 | Yes |
| 928-535 | HEBER | 4426 | — | Yes |
| 928-536 | SNOWFLAKE | 4426 | — | — |
| 928-537 | SHOW LOW | 4426 | — | — |
| 928-538 | BULLHEADCY | 630E | 2020-10-22 | Yes |
| 928-539 | YUMA | 9636 | — | Yes |
| 928-540 | LKHAVASUCY | 6572 | 2024-04-04 | Yes |
| 928-541 | PRESCOTT | 9636 | — | Yes |
| 928-542 | BULLHEADCY | 6529 | 2001-08-15 | Yes |
| 928-543 | WICKENBURG | 630E | — | Yes |
| 928-544 | CASTLEROCK | 965H | 2020-06-02 | Yes |
| 928-545 | TEECNOSPOS | 6010 | 2021-09-23 | — |
| 928-546 | BULLHEADCY | 516J | 2022-01-10 | Yes |
| 928-547 | FLAGSTAFF | 6572 | 2024-06-05 | Yes |
| 928-548 | YUMA | 6572 | 2025-08-07 | Yes |
| 928-549 | FLAGSTAFF | 6572 | 2025-10-10 | Yes |
| 928-550 | SOMERTON | 6529 | 2005-06-02 | Yes |
| 928-551 | SPRINGERVL | 6572 | 2008-01-07 | Yes |
| 928-552 | SAFFORD | 9636 | — | — |
| 928-553 | BULLHEADCY | 6529 | 2025-11-06 | Yes |
| 928-554 | SEDONA | 9636 | — | Yes |
| 928-555 | DIR ASST | MULT | — | — |
| 928-556 | FLAGSTAFF | 9636 | — | — |
| 928-557 | SAFFORD | 6010 | 2026-01-14 | Yes |
| 928-558 | GREER | 508J | 2015-08-28 | Yes |
| 928-559 | SPRINGERVL | 6572 | 2026-06-05 | Yes |
| 928-563 | FLAGSTAFF | 630E | — | — |
| 928-564 | MEADVIEW | 2172 | — | Yes |
| 928-565 | KINGMAN | 2172 | — | Yes |
| 928-566 | LKHAVASUCY | 612K | — | Yes |
| 928-567 | SEDONA | 9636 | — | — |
| 928-569 | FLAGSTAFF | 630E | — | — |
| 928-570 | SAFFORD | 7217 | 2025-08-21 | Yes |
| 928-571 | SAFFORD | 7217 | 2025-08-21 | Yes |
| 928-572 | SAFFORD | 7217 | 2025-08-21 | Yes |
| 928-573 | SAFFORD | 7217 | 2025-08-21 | Yes |
| 928-574 | SAFFORD | 7217 | 2025-08-21 | Yes |
| 928-575 | PARKER | 612K | — | Yes |
| 928-577 | MOHAVE VLY | 6572 | — | Yes |
| 928-580 | YUMA | 6572 | — | — |
| 928-581 | YUMA | 6572 | — | — |
| 928-582 | PRESCOTT | 6572 | 2016-10-10 | Yes |
| 928-583 | PRESCOTT | 9636 | 2001-02-22 | Yes |
| 928-585 | WINSLOW | 630E | — | — |
| 928-587 | WINSLOW | 6572 | — | — |
| 928-588 | WICKENBURG | 7175 | — | Yes |
| 928-589 | WINSLOW | 7175 | — | Yes |
| 928-592 | SEDONA | 9636 | — | Yes |
| 928-593 | SEDONA | 5562 | — | Yes |
| 928-594 | WHITERIVER | 4146 | 2005-12-20 | — |
| 928-595 | PAYSON | 6010 | — | Yes |
| 928-596 | PAYSON | 7175 | — | Yes |
| 928-597 | YUMA | 630E | — | — |
| 928-598 | WIKIEUP | 630E | 2020-12-24 | Yes |
| 928-599 | GRANDCNYON | 7175 | — | Yes |
| 928-600 | FLAGSTAFF | 6529 | — | Yes |
| 928-605 | BULLHEADCY | 6010 | 2015-03-13 | Yes |
| 928-606 | FLAGSTAFF | 6572 | — | — |
| 928-607 | FLAGSTAFF | 6572 | — | — |
| 928-608 | PAGE | 9636 | — | Yes |
| 928-609 | GREENEHVN | 6010 | 2022-02-09 | Yes |
| 928-610 | BULLHEADCY | 630E | 2021-02-28 | Yes |
| 928-611 | XXXXXXXXXX | MULT | — | — |
| 928-612 | PAGE | 6010 | — | Yes |
| 928-613 | WINSLOW | 4146 | — | Yes |
| 928-614 | PAGE | 6572 | — | Yes |
| 928-615 | YUMA | 6572 | 2015-01-19 | Yes |
| 928-622 | FLAGSTAFF | 516J | 2022-02-17 | 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.