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 |
|---|---|---|---|---|---|---|
| 2025-06-27 | 364-364 | 3XXX4XXX · 2 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | SEBREE | KY |
| 2023-05-05 | 364-646 | 2XXX4XXX · 2 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | UNIONTOWN | KY |
| 2023-05-04 | 364-640 | 0XXX1XXX4XXX · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | HICKMAN | KY |
| 2023-05-04 | 364-844 | 0XXX4XXX9XXX · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | MAYFIELD | KY |
| 2023-05-03 | 364-360 | 0XXX1XXX3XXX8XXX · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | DIXON | KY |
| 2023-05-02 | 364-340 | 0XXX1XXX3XXX · 2 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | BROWNSVL | KY |
| 2022-06-10 | 364-464 | 6XXX which blocks → | ONVOY SPECTRUM, LLC | 624H | OWENSBORO | KY |
| 2022-06-10 | 364-643 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | BOWLNGGREN | KY |
| 2022-06-10 | 364-664 | 4XXX6XXX · 2 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | MADISONVL | KY |
| 2021-06-04 | 364-365 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | CECILIA | KY |
| 2021-04-15 | 364-221 | 1XXX which blocks → | ONVOY SPECTRUM, LLC | 624H | COLUMBUS | KY |
| 2021-04-15 | 364-232 | 1XXX which blocks → | ONVOY SPECTRUM, LLC | 624H | MAMOTHCAVE | KY |
| 2019-10-08 | 364-710 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | ELIZABTHTN | KY |
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.