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 |
|---|---|---|---|---|---|---|
| 2017-04-14 | 603-258 | 0XXX1XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | HOLLIS | NH |
| 2008-03-10 | 603-820 | 0–9 XXXall 10 · 2 holders which blocks → | METROPCS, INC. | 5562 | MERRIMACK | NH |
| 2003-06-09 | 603-300 | 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | CHESTER | NH |
| 2002-08-09 | 603-996 | 3XXX9XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | PLYMOUTH | NH |
| 2002-08-09 | 603-997 | 0XXX7XXX which blocks → | METROPCS, INC. | 5562 | HAMPTON | NH |
| 2002-07-08 | 603-721 | 0XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → | METROPCS, INC. | 5562 | MILFORD | NH |
| 2002-07-08 | 603-998 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | LACONIA | NH |
| 2002-05-20 | 603-793 | 0XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | EXETER | NH |
| 2002-05-20 | 603-973 | 0XXX5XXX7XXX which blocks → | METROPCS, INC. | 5562 | ROCHESTER | NH |
| 2002-01-22 | 603-608 | 1XXX2XXX3XXX4XXX5XXX · 4 holders which blocks → | METROPCS, INC. | 5562 | NORTHWOOD | NH |
| 2001-12-19 | 603-944 | 2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | SO HAMPTON | NH |
| — | 603-799 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | METROPCS, INC. | 5562 | MANCHESTER | NH |
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.