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 |
|---|---|---|---|---|---|---|
| 2011-03-07 | 203-864 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | BRIDGEPORT | CT |
| 2011-02-09 | 203-519 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | WATERBURY | CT |
| 2008-12-10 | 203-360 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | BRIDGEPORT | CT |
| 2008-10-03 | 203-600 | 0–9 XXXall 10 · 2 holders which blocks → | METROPCS, INC. | 5562 | MERIDEN | CT |
| 2008-10-03 | 203-684 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | NEW HAVEN | CT |
| 2008-10-03 | 203-802 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | WATERBURY | CT |
| 2008-10-03 | 203-850 | 0–9 XXXall 10 · 2 holders which blocks → | METROPCS, INC. | 5562 | NEW HAVEN | CT |
| 2007-09-11 | 203-309 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | DARIEN | CT |
| 2007-06-29 | 203-424 | 0–9 XXXall 10 · 5 holders which blocks → | METROPCS, INC. | 5562 | DARIEN | CT |
| 2001-03-26 | 203-650 | none assigned yet which blocks → | METROPCS, INC. | 5562 | BRIDGEPORT | CT |
| — | 203-395 | none assigned yet which blocks → | METROPCS, INC. | 5562 | BRIDGEPORT | CT |
| — | 203-449 | none assigned yet which blocks → | METROPCS, INC. | 5562 | BRIDGEPORT | CT |
| — | 203-460 | 0XXX1XXX2XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → | METROPCS, INC. | 5562 | DANBURY | CT |
| — | 203-496 | 4XXX5XXX8XXX which blocks → | METROPCS, INC. | 5562 | GREENWICH | CT |
| — | 203-509 | none assigned yet which blocks → | METROPCS, INC. | 5562 | WATERBURY | CT |
| — | 203-510 | none assigned yet which blocks → | METROPCS, INC. | 5562 | WATERBURY | CT |
| — | 203-526 | none assigned yet which blocks → | METROPCS, INC. | 5562 | BRIDGEPORT | CT |
| — | 203-537 | none assigned yet which blocks → | METROPCS, INC. | 5562 | MERIDEN | CT |
| — | 203-545 | none assigned yet which blocks → | METROPCS, INC. | 5562 | BRIDGEPORT | CT |
| — | 203-565 | 0XXX which blocks → | METROPCS, INC. | 5562 | WATERBURY | CT |
| — | 203-613 | 0XXX which blocks → | METROPCS, INC. | 5562 | NORWALK | CT |
| — | 203-820 | 0XXX2XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | NORWALK | CT |
| — | 203-952 | 0XXX2XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | NORWALK | CT |
| — | 203-981 | none assigned yet which blocks → | METROPCS, INC. | 5562 | NORWALK | CT |
| — | 203-982 | none assigned yet which blocks → | METROPCS, INC. | 5562 | WATERBURY | CT |
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.