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 |
|---|---|---|---|---|---|---|
| 2025-01-28 | 442-485 | 0XXX1XXX9XXX · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | BARSTOW | CA |
| 2023-04-12 | 442-421 | 4XXX5XXX which blocks → | ONVOY SPECTRUM, LLC | 624H | LKISABELLA | CA |
| 2023-04-12 | 442-425 | 0–9 XXXall 10 · 2 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | VICTORVL | CA |
| 2023-04-12 | 442-426 | 0XXX2XXX4XXX5XXX9XXX · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | WRIGHTWOOD | CA |
| 2023-04-12 | 442-445 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | BISHOP | CA |
| 2023-04-12 | 442-447 | 0XXX1XXX2XXX4XXX5XXX · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | BORON | CA |
| 2023-04-12 | 442-448 | 4XXX5XXX8XXX · 2 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | LENWOOD | CA |
| 2022-07-11 | 442-384 | 0XXX7XXX · 2 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | DESERT CTR | CA |
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.