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 |
|---|---|---|---|---|---|---|
| 2025-01-29 | 667-503 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | BALTIMORE | MD |
| 2021-06-17 | 667-361 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | CHURCHHILL | MD |
| 2021-06-17 | 667-467 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | DENTON | MD |
| 2021-06-17 | 667-665 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | HILLSBORO | MD |
| 2021-06-17 | 667-669 | 2XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | GALENA | MD |
| 2021-06-17 | 667-775 | 1XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | MILLINGTON | MD |
| 2021-05-27 | 667-656 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | EDGEWOOD | MD |
| 2021-04-26 | 667-644 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | SEVERNA PK | MD |
| 2021-04-26 | 667-647 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | NORTH EAST | MD |
| 2021-04-26 | 667-668 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | FALLSTON | MD |
| 2021-04-26 | 667-772 | 0–9 XXXall 10 · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | SPARKSGLNC | MD |
| 2021-04-26 | 667-778 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | SPARROWSPT | MD |
| 2018-06-19 | 667-250 | 0–9 XXXall 10 · 2 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | BALTIMORE | MD |
| 2018-06-19 | 667-252 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | SALISBURY | MD |
| — | 667-262 | 0–9 XXXall 10 · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | BALTIMORE | MD |
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.