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 |
|---|---|---|---|---|---|---|
| 2025-01-28 | 931-440 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | CLARKSVL | TN |
| 2024-04-18 | 931-420 | 0XXX which blocks → | ONVOY SPECTRUM, LLC | 624H | MONTEREY | TN |
| 2024-04-18 | 931-428 | 0XXX1XXX8XXX9XXX · 2 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | SPARTA | TN |
| 2023-05-15 | 931-390 | 3XXX which blocks → | ONVOY SPECTRUM, LLC | 624H | CUNNINGHAM | TN |
| 2023-05-15 | 931-399 | 0XXX9XXX · 2 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | ELKTON | TN |
| 2023-05-15 | 931-630 | 0XXX3XXX · 2 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | FREDONIA | TN |
| 2023-05-15 | 931-690 | 0XXX8XXX9XXX · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | MTPLEASANT | TN |
| 2023-05-15 | 931-930 | 3XXX which blocks → | ONVOY SPECTRUM, LLC | 624H | WARTRACE | TN |
| 2021-11-15 | 931-907 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | COOKEVILLE | TN |
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.