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 |
|---|---|---|---|---|---|---|
| 2006-06-06 | 815-219 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | CRYSTAL LK | IL |
| 2003-04-14 | 815-994 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | METROPCS, INC. | 5562 | DIXON | IL |
| 2002-07-05 | 815-719 | 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | METROPCS, INC. | 5562 | PRINCETON | IL |
| 2002-07-05 | 815-955 | none assigned yet which blocks → | METROPCS, INC. | 5562 | JOLIET | IL |
| 2002-07-05 | 815-970 | 8XXX9XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | SYCAMORE | IL |
| 2002-05-03 | 815-560 | 0–9 XXXall 10 · 7 holders which blocks → | METROPCS, INC. | 5562 | HARVARD | IL |
| 2001-10-31 | 815-716 | 1XXX5XXX8XXX9XXX · 4 holders which blocks → | METROPCS, INC. | 5562 | STERLING | IL |
| — | 815-388 | 0–9 XXXall 10 · 7 holders which blocks → | METROPCS, INC. | 5562 | MCHENRY | IL |
| — | 815-403 | 0XXX2XXX5XXX7XXX8XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | MCHENRY | IL |
| — | 815-404 | 0XXX2XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | CRYSTAL LK | IL |
| — | 815-501 | 0XXX2XXX which blocks → | METROPCS, INC. | 5562 | DE KALB | IL |
| — | 815-503 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | METROPCS, INC. | 5562 | MENDOTA | IL |
| — | 815-557 | 2XXX which blocks → | METROPCS, INC. | 5562 | JOLIET | IL |
| — | 815-579 | 3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | LA SALLE | IL |
| — | 815-650 | 0–9 XXXall 10 · 5 holders which blocks → | METROPCS, INC. | 5562 | FREEPORT | IL |
| — | 815-739 | none assigned yet which blocks → | METROPCS, INC. | 5562 | SYCAMORE | IL |
| — | 815-914 | 0XXX2XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | ROCKFORD | IL |
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.