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 |
|---|---|---|---|---|---|---|
| 2022-12-01 | 240-973 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | WSNGTNZN12 | MD |
| 2022-01-11 | 240-909 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | LAUREL236 | MD |
| 2022-01-10 | 240-905 | 0XXX1XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → | METROPCS, INC. | 5562 | BRANDYWINE | MD |
| 2018-04-09 | 240-590 | 0–9 XXXall 10 · 5 holders which blocks → | METROPCS, INC. | 5562 | WSNGTNZN12 | MD |
| 2013-07-16 | 240-614 | 0–9 XXXall 10 · 6 holders which blocks → | METROPCS, INC. | 5562 | WSNGTNZN10 | MD |
| 2013-05-29 | 240-615 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | WSHNGTNZN4 | MD |
| 2010-07-22 | 240-452 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | HAGERSTOWN | MD |
| 2002-11-04 | 240-388 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | GAITHERSBG | MD |
| 2001-12-12 | 240-522 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | METROPCS, INC. | 5562 | CUMBERLAND | MD |
| 2001-04-17 | 240-625 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | HAGERSTOWN | MD |
| 2001-03-15 | 240-216 | 5XXX9XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | WALDORF | MD |
| 2001-03-15 | 240-793 | 2XXX3XXX which blocks → | METROPCS, INC. | 5562 | GAITHERSBG | MD |
| 2001-01-16 | 240-412 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | WALDORF | MD |
| — | 240-299 | none assigned yet which blocks → | METROPCS, INC. | 5562 | WALDORF | MD |
| — | 240-346 | 0XXX2XXX which blocks → | METROPCS, INC. | 5562 | WALDORF | MD |
| — | 240-372 | none assigned yet which blocks → | METROPCS, INC. | 5562 | GAITHERSBG | MD |
| — | 240-417 | none assigned yet which blocks → | METROPCS, INC. | 5562 | WSHNGTNZN5 | MD |
| — | 240-508 | none assigned yet which blocks → | METROPCS, INC. | 5562 | WSHNGTNZN5 | MD |
| — | 240-674 | none assigned yet which blocks → | METROPCS, INC. | 5562 | FREDERICK | MD |
| — | 240-848 | 0–9 XXXall 10 · 5 holders which blocks → | METROPCS, INC. | 5562 | GAITHERSBG | MD |
| — | 240-882 | none assigned yet which blocks → | METROPCS, INC. | 5562 | WSHNGTNZN5 | MD |
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.