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 |
|---|---|---|---|---|---|---|
| 2003-04-21 | 360-783 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → | UNITED STATES CELLULAR - WA | 6270 | LONG BEACH | WA |
| 2002-10-17 | 360-208 | 0–9 XXXall 10 · 5 holders which blocks → | UNITED STATES CELLULAR - WA | 6270 | SOUTH BEND | WA |
| 2002-09-19 | 360-861 | 0–9 XXXall 10 · 6 holders which blocks → | UNITED STATES CELLULAR - WA | 6270 | ELMA | WA |
| — | 360-401 | 2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → | UNITED STATES CELLULAR - WA | 6270 | SHELTON | WA |
| — | 360-520 | 8XXX which blocks → | UNITED STATES CELLULAR - WA | 6270 | CHEHALIS | WA |
| — | 360-590 | 8XXX9XXX which blocks → | UNITED STATES CELLULAR - WA | 6270 | ABERDEEN | WA |
| — | 360-591 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | UNITED STATES CELLULAR - WA | 6270 | ABERDEEN | WA |
| — | 360-747 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | UNITED STATES CELLULAR - WA | 6270 | LONGVIEW | WA |
| — | 360-749 | 8XXX which blocks → | UNITED STATES CELLULAR - WA | 6270 | LONGVIEW | WA |
| — | 360-751 | none assigned yet which blocks → | UNITED STATES CELLULAR - WA | 6270 | LONGVIEW | WA |
| — | 360-880 | none assigned yet which blocks → | UNITED STATES CELLULAR - WA | 6270 | CHEHALIS | WA |
| — | 360-996 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | UNITED STATES CELLULAR - WA | 6270 | CHEHALIS | WA |
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.