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 |
|---|---|---|---|---|---|---|
| 2021-10-05 | 559-716 | 0–9 XXXall 10 · 5 holders which blocks → | METROPCS, INC. | 5562 | MADERA | CA |
| 2015-04-13 | 559-541 | 0–9 XXXwhole prefix which blocks → | METROPCS, INC. | 5562 | FRESNO | CA |
| 2014-12-30 | 559-724 | 0–9 XXXall 10 · 5 holders which blocks → | METROPCS, INC. | 5562 | FRESNO | CA |
| 2014-12-22 | 559-652 | 0–9 XXXwhole prefix which blocks → | METROPCS, INC. | 5562 | FRESNO | CA |
| 2014-08-28 | 559-614 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | FRESNO | CA |
| 2002-03-21 | 559-759 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | TULARE | CA |
| 2002-03-21 | 559-817 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → | METROPCS, INC. | 5562 | LEMOORE | CA |
| 2001-12-26 | 559-318 | 1XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → | METROPCS, INC. | 5562 | SELMA | CA |
| — | 559-286 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | FRESNO | CA |
| — | 559-308 | 7XXX8XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | VISALIA | CA |
| — | 559-352 | 3XXX4XXX which blocks → | METROPCS, INC. | 5562 | FRESNO | CA |
| — | 559-358 | 2XXX3XXX4XXX8XXX · 4 holders which blocks → | METROPCS, INC. | 5562 | TULARE | CA |
| — | 559-364 | 0XXX1XXX2XXX3XXX5XXX8XXX9XXX · 5 holders which blocks → | METROPCS, INC. | 5562 | SANJOAQUIN | CA |
| — | 559-479 | 3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → | METROPCS, INC. | 5562 | MADERA | CA |
| — | 559-567 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | KERMAN | CA |
| — | 559-647 | none assigned yet which blocks → | METROPCS, INC. | 5562 | FRESNO | CA |
| — | 559-681 | none assigned yet which blocks → | METROPCS, INC. | 5562 | FRESNO | CA |
| — | 559-694 | 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | METROPCS, INC. | 5562 | FIREBAUGH | CA |
| — | 559-750 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | VISALIA | CA |
| — | 559-790 | none assigned yet which blocks → | METROPCS, INC. | 5562 | FRESNO | CA |
| — | 559-804 | 2XXX3XXX which blocks → | METROPCS, INC. | 5562 | VISALIA | CA |
| — | 559-805 | 1XXX2XXX which blocks → | METROPCS, INC. | 5562 | VISALIA | CA |
| — | 559-994 | 4XXX which blocks → | METROPCS, INC. | 5562 | FRESNO | 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.