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 |
|---|---|---|---|---|---|---|
| — | 510-517 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-520 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-541 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-579 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | FRNK MAIN | CA |
| — | 510-589 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | HAYWARD | CA |
| — | 510-590 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-599 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-604 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-610 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-612 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-648 | 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | FRNK MAIN | CA |
| — | 510-693 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-697 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-701 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-703 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-708 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-710 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-712 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-734 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | RICHMOND | CA |
| — | 510-759 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-761 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-813 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-816 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-861 | 3XXX4XXX5XXX7XXX8XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | HAYWARD | CA |
| — | 510-862 | 2XXX3XXX4XXX5XXX7XXX8XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | HAYWARD | CA |
| — | 510-918 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-928 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OKLD MN-PD | CA |
| — | 510-953 | 0–9 XXXall 10 · 5 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | FRNK MAIN | CA |
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.