NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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 |
|---|---|---|---|---|---|---|
| 2018-07-13 | 734-371 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | DUNDEE | MI |
| 2018-07-13 | 734-410 | 0–9 XXXall 10 · 5 holders which blocks → | METROPCS, INC. | 5562 | MONROE | MI |
| 2017-12-22 | 734-346 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | TRENTON | MI |
| 2011-02-21 | 734-636 | 0–9 XXXall 10 · 5 holders which blocks → | METROPCS, INC. | 5562 | MONROE | MI |
| 2007-03-20 | 734-363 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | TRENTON | MI |
| 2006-02-01 | 734-772 | 0–9 XXXall 10 · 5 holders which blocks → | METROPCS, INC. | 5562 | LIVONIA | MI |
| 2005-10-18 | 734-444 | 0–9 XXXwhole prefix which blocks → | METROPCS, INC. | 5562 | LIVONIA | MI |
| 2002-10-18 | 734-624 | none assigned yet which blocks → | METROPCS, INC. | 5562 | TRENTON | MI |
| 2001-05-10 | 734-833 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | DUNDEE | MI |
| 2001-05-01 | 734-818 | 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 6 holders which blocks → | METROPCS, INC. | 5562 | TRENTON | MI |
| — | 734-231 | none assigned yet which blocks → | METROPCS, INC. | 5562 | TRENTON | MI |
| — | 734-271 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | METROPCS, INC. | 5562 | CARLETON | MI |
| — | 734-341 | none assigned yet which blocks → | METROPCS, INC. | 5562 | TRENTON | MI |
| — | 734-680 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | METROPCS, INC. | 5562 | ANN ARBOR | MI |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.