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30 prefixes in 423 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 423-225 | BENTON | 124F | — | Yes |
| 423-226 | CHURCHHILL | 124F | 2010-05-28 | Yes |
| 423-302 | JOHNSON CY | 124F | 2008-11-10 | Yes |
| 423-347 | ROGERSVL | 124F | — | Yes |
| 423-380 | CLEVELAND | 124F | — | Yes |
| 423-397 | BENTON | 124F | 2017-07-06 | Yes |
| 423-399 | SULIVNGDNS | 124F | 2026-02-10 | Yes |
| 423-402 | CHATTNOOGA | 124F | 2008-06-20 | Yes |
| 423-403 | SO PITTSBG | 124F | 2017-05-01 | Yes |
| 423-446 | FALLBRANCH | 124F | — | Yes |
| 423-460 | MOUNTAINCY | 124F | 2010-09-02 | Yes |
| 423-481 | ROAN MT | 124F | 2011-09-01 | Yes |
| 423-528 | BAILEYTON | 124F | — | Yes |
| 423-550 | MIDWAY | 124F | 2023-01-25 | Yes |
| 423-556 | SODDYDAISY | 124F | 2018-08-30 | Yes |
| 423-565 | DECATUR | 124F | 2018-08-30 | Yes |
| 423-583 | SULIVNGDNS | 124F | 2018-09-26 | Yes |
| 423-590 | SO PITTSBG | 124F | 2019-05-03 | Yes |
| 423-597 | BENTON | 124F | 2019-05-22 | Yes |
| 423-641 | CLEVELAND | 124F | 2014-04-07 | Yes |
| 423-657 | MOSHEIM | 124F | 2015-01-28 | Yes |
| 423-684 | KINGSPORT | 124F | 2026-04-23 | Yes |
| 423-689 | BRISTOL | 124F | 2021-07-01 | Yes |
| 423-712 | BLUFF CITY | 124F | 2015-01-26 | Yes |
| 423-720 | NEWPORT | 124F | 2015-05-20 | Yes |
| 423-769 | BENTON | 124F | 2021-12-15 | Yes |
| 423-804 | BRISTOL | 124F | 2022-02-03 | Yes |
| 423-806 | MIDWAY | 124F | 2015-05-20 | Yes |
| 423-812 | GREENEVL | 124F | 2016-08-23 | Yes |
| 423-997 | ELIZABTHTN | 124F | 2025-08-07 | 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.