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 |
|---|---|---|---|---|---|---|
| 2026-01-09 | 775-585 | 9XXX which blocks → | T-MOBILE USA, INC. | 6529 | ELKO | NV |
| 2026-01-09 | 775-592 | 0XXX9XXX which blocks → | T-MOBILE USA, INC. | 6529 | SWEETWATER | NV |
| 2024-01-19 | 775-523 | 0–9 XXXwhole prefix which blocks → | T-MOBILE USA, INC. | 6529 | SWEETWATER | NV |
| 2022-07-13 | 775-495 | 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | GARDNERVL | NV |
| 2021-05-19 | 775-471 | 0–9 XXXwhole prefix which blocks → | T-MOBILE USA, INC. | 6529 | SWEETWATER | NV |
| 2016-06-17 | 775-300 | 0–9 XXXall 10 · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | RENO | NV |
| 2016-01-19 | 775-515 | 0–9 XXXall 10 · 7 holders which blocks → | T-MOBILE USA, INC. | 6529 | CARSONCITY | NV |
| 2014-10-09 | 775-470 | 0–9 XXXall 10 · 6 holders which blocks → | T-MOBILE USA, INC. | 6529 | RENO | NV |
| 2014-07-17 | 775-440 | 0–9 XXXall 10 · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | RENO | NV |
| 2011-11-10 | 775-203 | 0–9 XXXall 10 · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | RENO | NV |
| 2010-12-02 | 775-400 | 0–9 XXXall 10 · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | CARSONCITY | NV |
| 2008-01-17 | 775-461 | 0–9 XXXall 10 · 8 holders which blocks → | T-MOBILE USA, INC. | 6529 | CARSONCITY | NV |
| 2007-04-30 | 775-389 | 0–9 XXXall 10 · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | ELKO | NV |
| 2002-10-07 | 775-292 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | T-MOBILE USA, INC. | 6529 | GARDNERVL | NV |
| 2002-08-27 | 775-291 | 0–9 XXXall 10 · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | CARSONCITY | NV |
| 2002-07-23 | 775-294 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | FALLON | NV |
| 2002-03-26 | 775-338 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | RENO | NV |
| 2001-09-19 | 775-287 | 3XXX which blocks → | T-MOBILE USA, INC. | 6529 | RENO | NV |
| 2001-05-09 | 775-232 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | RENO | NV |
| 2001-03-23 | 775-219 | 0–9 XXXall 10 · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | RENO | NV |
| — | 775-221 | 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | RENO | NV |
| — | 775-247 | 0–9 XXXall 10 · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | RENO | NV |
| — | 775-250 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | RENO | NV |
| — | 775-350 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | CARSONCITY | NV |
| — | 775-450 | 0XXX which blocks → | T-MOBILE USA, INC. | 6529 | GARDNERVL | NV |
| — | 775-690 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | CARSONCITY | NV |
| — | 775-691 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | CARSONCITY | NV |
| — | 775-745 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | RENO | NV |
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.