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 |
|---|---|---|---|---|---|---|
| — | 660-222 | not yet reported which blocks → | CHARITON VALLEY TEL. CO. | 1864 | BYNUMVILLE | MO |
| — | 660-226 | not yet reported which blocks → | CHARITON VALLEY TEL. CO. | 1864 | NEWCAMBRIA | MO |
| — | 660-239 | none assigned yet which blocks → | CHARITON VALLEY TEL. CO. | 1864 | ATLANTA | MO |
| — | 660-261 | not yet reported which blocks → | CHARITON VALLEY TEL. CO. | 1864 | CLIFTON HL | MO |
| — | 660-277 | 1XXX2XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | CHARITON VALLEY TEL. CO. | 1864 | HUNTSVILLE | MO |
| — | 660-295 | not yet reported which blocks → | CHARITON VALLEY TEL. CO. | 1864 | JACKSONVL | MO |
| — | 660-388 | 4XXX8XXX · 2 holders which blocks → | CHARITON VALLEY TEL. CO. | 1864 | SALISBURY | MO |
| — | 660-481 | not yet reported which blocks → | CHARITON VALLEY TEL. CO. | 1864 | FOR GREEN | MO |
| — | 660-486 | not yet reported which blocks → | CHARITON VALLEY TEL. CO. | 1864 | ETHEL | MO |
| — | 660-534 | not yet reported which blocks → | CHARITON VALLEY TEL. CO. | 1864 | BOSWORTH | MO |
| — | 660-549 | not yet reported which blocks → | CHARITON VALLEY TEL. CO. | 1864 | DE WITT | MO |
| — | 660-565 | not yet reported which blocks → | CHARITON VALLEY TEL. CO. | 1864 | HALE | MO |
| — | 660-689 | not yet reported which blocks → | CHARITON VALLEY TEL. CO. | 1864 | NEW BOSTON | MO |
| — | 660-695 | not yet reported which blocks → | CHARITON VALLEY TEL. CO. | 1864 | BUCKLIN | MO |
| — | 660-768 | not yet reported which blocks → | CHARITON VALLEY TEL. CO. | 1864 | CALLAO | MO |
| — | 660-773 | not yet reported which blocks → | CHARITON VALLEY TEL. CO. | 1864 | BEVIER | MO |
| — | 660-775 | not yet reported which blocks → | CHARITON VALLEY TEL. CO. | 1864 | EXCELLO | MO |
| — | 660-777 | not yet reported which blocks → | CHARITON VALLEY TEL. CO. | 1864 | PRAIRIE HL | 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.