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 |
|---|---|---|---|---|---|---|
| 2024-12-30 | 585-791 | 0XXX6XXX · 2 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | HENRIETTA | NY |
| 2021-05-14 | 585-650 | 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | RUSHFORD | NY |
| 2021-05-14 | 585-665 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | OAKFIELD | NY |
| 2021-05-14 | 585-772 | 0–9 XXXall 10 · 5 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | WELLSVILLE | NY |
| 2021-05-14 | 585-868 | 0XXX3XXX6XXX8XXX9XXX · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | VARYSBURG | NY |
| 2021-04-13 | 585-570 | 0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | FRIENDSHIP | NY |
| 2021-04-13 | 585-686 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | HOLLEY | NY |
| 2021-04-13 | 585-744 | 6XXX7XXX9XXX · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | JAVA | NY |
| 2021-04-13 | 585-767 | 2XXX6XXX7XXX9XXX · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | FRANKLINVL | NY |
| 2021-04-13 | 585-835 | 5XXX6XXX8XXX · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | KENDALL | NY |
| 2021-04-02 | 585-605 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | FILLMORE | NY |
| 2021-04-02 | 585-745 | 0–9 XXXall 10 · 5 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | ALBION | NY |
| 2021-04-02 | 585-858 | 0XXX1XXX2XXX3XXX5XXX6XXX9XXX · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | BELFAST | NY |
| 2021-04-02 | 585-875 | 0XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | CUBA | NY |
| 2021-04-02 | 585-885 | 2XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | ELBA | NY |
| 2019-10-04 | 585-710 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | ROCHESTER | NY |
| — | 585-937 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | ALDEN | NY |
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.