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 |
|---|---|---|---|---|---|---|
| 2023-08-05 | 540-540 | 0XXX2XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | GLASGOW | VA |
| 2023-08-05 | 540-804 | 0XXX1XXX4XXX7XXX · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | SHAWSVILLE | VA |
| 2021-02-05 | 540-670 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | FREDECKSBG | VA |
| 2021-01-11 | 540-704 | 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | HARRISONBG | VA |
| 2018-06-21 | 540-870 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | FREDECKSBG | VA |
| 2018-06-20 | 540-541 | 0–9 XXXall 10 · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | ROANOKE | VA |
| — | 540-673 | 0XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | SHENANDHPK | VA |
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.