NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026
The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 937-301 | 5XXX6XXX7XXX8XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DAYTON | OH |
| — | 937-329 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DAYTON | OH |
| — | 937-336 | 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | EATON | OH |
| — | 937-344 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DAYTON | OH |
| — | 937-409 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DAYTON | OH |
| — | 937-423 | 6XXX7XXX8XXX9XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | GREENVILLE | OH |
| — | 937-430 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DAYTON | OH |
| — | 937-546 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DAYTON | OH |
| — | 937-581 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DAYTON | OH |
| — | 937-594 | 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MARYSVILLE | OH |
| — | 937-597 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | BELLEFNTAN | OH |
| — | 937-622 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | SIDNEY | OH |
| — | 937-654 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DAYTON | OH |
| — | 937-658 | 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | SIDNEY | OH |
| — | 937-750 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DAYTON | OH |
| — | 937-760 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DAYTON | OH |
| — | 937-763 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | HILLSBORO | OH |
| — | 937-765 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | NEWCARLISL | OH |
| — | 937-768 | 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | XENIA | OH |
| — | 937-823 | 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DAYTON | OH |
| — | 937-825 | 1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DAYTON | OH |
| — | 937-925 | 4XXX7XXX8XXX9XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | SPRINGFLD | OH |
| — | 937-926 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | SPRINGFLD | OH |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.