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 |
|---|---|---|---|---|---|---|
| 2018-03-23 | 925-510 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | CONCORD | CA |
| 2012-06-25 | 925-446 | 0–9 XXXall 10 · 6 holders which blocks → | METROPCS, INC. | 5562 | CONCORD | CA |
| 2001-10-18 | 925-207 | none assigned yet which blocks → | METROPCS, INC. | 5562 | CONCORD | CA |
| 2001-09-21 | 925-339 | not yet reported which blocks → | METROPCS, INC. | 5562 | LIVERMORE | CA |
| 2001-09-21 | 925-565 | not yet reported which blocks → | METROPCS, INC. | 5562 | ANTIOCH | CA |
| 2001-09-21 | 925-594 | 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | METROPCS, INC. | 5562 | DANVILLE | CA |
| 2001-09-21 | 925-812 | 6XXX7XXX8XXX9XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | MARTINEZ | CA |
| 2001-08-22 | 925-497 | not yet reported which blocks → | METROPCS, INC. | 5562 | CONCORD | CA |
| 2001-08-22 | 925-705 | 4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | METROPCS, INC. | 5562 | WALNUT CRK | CA |
| 2001-05-18 | 925-595 | none assigned yet which blocks → | METROPCS, INC. | 5562 | CONCORD | CA |
| — | 925-250 | none assigned yet which blocks → | METROPCS, INC. | 5562 | CONCORD | CA |
| — | 925-260 | none assigned yet which blocks → | METROPCS, INC. | 5562 | WALNUT CRK | CA |
| — | 925-383 | none assigned yet which blocks → | METROPCS, INC. | 5562 | CONCORD | CA |
| — | 925-518 | none assigned yet which blocks → | METROPCS, INC. | 5562 | LIVERMORE | CA |
| — | 925-525 | none assigned yet which blocks → | METROPCS, INC. | 5562 | LIVERMORE | CA |
| — | 925-535 | 0XXX1XXX2XXX3XXX5XXX8XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | PLEASANTON | CA |
| — | 925-575 | 2XXX3XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | DANVILLE | CA |
| — | 925-695 | 0–9 XXXall 10 · 5 holders which blocks → | METROPCS, INC. | 5562 | CONCORD | CA |
| — | 925-727 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | ANTIOCH | CA |
| — | 925-765 | 7XXX8XXX9XXX which blocks → | METROPCS, INC. | 5562 | WALNUT CRK | CA |
| — | 925-864 | none assigned yet which blocks → | METROPCS, INC. | 5562 | CONCORD | CA |
| — | 925-895 | none assigned yet which blocks → | METROPCS, INC. | 5562 | DUBLN-SNRM | CA |
| — | 925-984 | 2XXX which blocks → | METROPCS, INC. | 5562 | DANVILLE | CA |
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.