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 |
|---|---|---|---|---|---|---|
| 2011-09-09 | 401-403 | 0–9 XXXall 10 · 2 holders which blocks → | METROPCS, INC. | 5562 | PROVIDENCE | RI |
| 2011-08-04 | 401-327 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | PROVIDENCE | RI |
| 2011-03-11 | 401-332 | 0–9 XXXall 10 · 2 holders which blocks → | METROPCS, INC. | 5562 | PROVIDENCE | RI |
| 2009-04-10 | 401-548 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | PAWTUCKET | RI |
| 2008-07-25 | 401-516 | 0–9 XXXwhole prefix which blocks → | METROPCS, INC. | 5562 | PROVIDENCE | RI |
| 2008-03-06 | 401-390 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | PROVIDENCE | RI |
| 2002-10-23 | 401-206 | 0XXX4XXX5XXX which blocks → | METROPCS, INC. | 5562 | W WARWICK | RI |
| 2002-10-23 | 401-207 | none assigned yet which blocks → | METROPCS, INC. | 5562 | NARRAGNSTT | RI |
| 2002-10-23 | 401-252 | 0XXX2XXX4XXX5XXX8XXX · 4 holders which blocks → | METROPCS, INC. | 5562 | WARREN | RI |
| 2002-10-23 | 401-269 | 0XXX2XXX3XXX4XXX5XXX7XXX · 5 holders which blocks → | METROPCS, INC. | 5562 | COVENTRY | RI |
| 2002-10-23 | 401-297 | 0XXX2XXX3XXX4XXX5XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | BRISTOL | RI |
| 2002-10-23 | 401-300 | 0XXX3XXX4XXX5XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | CENTREDALE | RI |
| 2002-10-23 | 401-309 | 0XXX4XXX5XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | WOONSOCKET | RI |
| 2002-07-30 | 401-391 | 0XXX3XXX4XXX5XXX which blocks → | METROPCS, INC. | 5562 | WARWICK | RI |
| 2002-07-30 | 401-418 | 3XXX8XXX9XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | PORTSMOUTH | RI |
| 2002-07-30 | 401-617 | none assigned yet which blocks → | METROPCS, INC. | 5562 | PAWTUCKET | RI |
| 2002-03-12 | 401-413 | none assigned yet which blocks → | METROPCS, INC. | 5562 | PROVIDENCE | RI |
| 2001-04-11 | 401-623 | 4XXX5XXX8XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | COVENTRY | RI |
| — | 401-261 | none assigned yet which blocks → | METROPCS, INC. | 5562 | PROVIDENCE | RI |
| — | 401-265 | none assigned yet which blocks → | METROPCS, INC. | 5562 | PROVIDENCE | RI |
| — | 401-345 | none assigned yet which blocks → | METROPCS, INC. | 5562 | PROVIDENCE | RI |
| — | 401-419 | none assigned yet which blocks → | METROPCS, INC. | 5562 | PROVIDENCE | RI |
| — | 401-481 | none assigned yet which blocks → | METROPCS, INC. | 5562 | PROVIDENCE | RI |
| — | 401-559 | none assigned yet which blocks → | METROPCS, INC. | 5562 | PROVIDENCE | RI |
| — | 401-579 | 1XXX2XXX3XXX4XXX7XXX8XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | WOONSOCKET | RI |
| — | 401-639 | none assigned yet which blocks → | METROPCS, INC. | 5562 | PROVIDENCE | RI |
| — | 401-640 | none assigned yet which blocks → | METROPCS, INC. | 5562 | PROVIDENCE | RI |
| — | 401-641 | none assigned yet which blocks → | METROPCS, INC. | 5562 | PROVIDENCE | RI |
| — | 401-952 | none assigned yet which blocks → | METROPCS, INC. | 5562 | PROVIDENCE | RI |
| — | 401-954 | none assigned yet which blocks → | METROPCS, INC. | 5562 | PROVIDENCE | RI |
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.