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 |
|---|---|---|---|---|---|---|
| 2017-01-11 | 660-348 | 6XXX9XXX · 2 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | MILAN | MO |
| 2016-08-31 | 660-297 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | ALBANY | MO |
| 2016-08-12 | 660-858 | 0XXX1XXX5XXX8XXX9XXX · 5 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | FLORENCE | MO |
| 2016-07-11 | 660-470 | 0XXX9XXX · 2 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | LACLEDE | MO |
| 2016-07-11 | 660-559 | 0XXX5XXX9XXX · 3 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | MADISON | MO |
| 2015-06-17 | 660-954 | 9XXX which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | GALLATIN | MO |
| — | 660-256 | 9XXX which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | ROTHVILLE | MO |
| — | 660-265 | 2XXX which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | MILAN | MO |
| — | 660-266 | 2XXX5XXX6XXX · 3 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | HOLLIDAY | MO |
| — | 660-272 | 2XXX7XXX · 2 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | MENDON | MO |
| — | 660-291 | 7XXX9XXX · 2 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | MADISON | MO |
| — | 660-367 | 1XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | PATTONSBG | MO |
| — | 660-368 | 3XXX5XXX6XXX7XXX · 2 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | FLORENCE | MO |
| — | 660-445 | 5XXX6XXX9XXX · 3 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | MILAN | MO |
| — | 660-533 | 0XXX1XXX3XXX5XXX7XXX · 4 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | COFFEY | MO |
| — | 660-564 | 6XXX8XXX · 2 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | GRANT CITY | MO |
| — | 660-663 | not yet reported which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | GALLATIN | MO |
| — | 660-726 | 2XXX8XXX · 2 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | ALBANY | MO |
| — | 660-749 | 1XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | WINSTON | MO |
| — | 660-786 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | ALLENDALE | MO |
| — | 660-828 | 1XXX2XXX3XXX5XXX7XXX8XXX · 3 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | JAMESON | MO |
| — | 660-856 | none assigned yet which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | SUMNER | MO |
| — | 660-963 | none assigned yet which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | LACLEDE | MO |
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.