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 |
|---|---|---|---|---|---|---|
| 2026-06-15 | 346-936 | 0XXX9XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | CLEVELAND | TX |
| 2022-11-22 | 346-605 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | HSTNSUBURB | TX |
| 2022-11-22 | 346-607 | 0–9 XXXall 10 · 2 holders which blocks → | METROPCS, INC. | 5562 | HOUSTON | TX |
| 2021-10-12 | 346-514 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | STAFFORD | TX |
| 2020-10-28 | 346-449 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | CHANNELVW | TX |
| 2020-10-28 | 346-450 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | SUGAR LAND | TX |
| 2019-08-19 | 346-390 | 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | BARKER | TX |
| 2019-08-19 | 346-391 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | SUGAR LAND | TX |
| 2019-08-19 | 346-392 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | SATSUMA | TX |
| 2019-08-19 | 346-393 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | STAFFORD | TX |
| 2019-08-19 | 346-394 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | CHANNELVW | TX |
| 2018-10-18 | 346-369 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | BEACH CITY | TX |
| 2018-10-18 | 346-371 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | STAFFORD | TX |
| 2017-11-15 | 346-283 | 0–9 XXXall 10 · 2 holders which blocks → | METROPCS, INC. | 5562 | STAFFORD | TX |
| 2017-11-15 | 346-284 | 0–9 XXXall 10 · 2 holders which blocks → | METROPCS, INC. | 5562 | BEACH CITY | TX |
| 2017-11-03 | 346-282 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | CHANNELVW | TX |
| 2017-07-17 | 346-264 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | BARKER | TX |
| 2017-03-28 | 346-255 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | CHANNELVW | TX |
| 2017-03-28 | 346-420 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | SUGAR LAND | TX |
| 2017-01-17 | 346-243 | 0–9 XXXall 10 · 2 holders which blocks → | METROPCS, INC. | 5562 | BARKER | TX |
| 2017-01-17 | 346-244 | 0–9 XXXall 10 · 5 holders which blocks → | METROPCS, INC. | 5562 | SATSUMA | TX |
| 2017-01-17 | 346-245 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | STAFFORD | TX |
| 2017-01-17 | 346-288 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | BEACH CITY | TX |
| 2016-10-11 | 346-779 | 0–9 XXXwhole prefix which blocks → | METROPCS, INC. | 5562 | SUGAR LAND | TX |
| 2016-07-14 | 346-760 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | BARKER | TX |
| 2015-06-01 | 346-801 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | BEACH CITY | TX |
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.