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 |
|---|---|---|---|---|---|---|
| — | 660-255 | not yet reported which blocks → | GREEN HILLS TEL. CORP. | 1890 | COWGILL | MO |
| — | 660-352 | 3XXX which blocks → | GREEN HILLS TEL. CORP. | 1890 | KNOXVILLE | MO |
| — | 660-354 | 0XXX which blocks → | GREEN HILLS TEL. CORP. | 1890 | POLO | MO |
| — | 660-484 | not yet reported which blocks → | GREEN HILLS TEL. CORP. | 1890 | STET | MO |
| — | 660-622 | not yet reported which blocks → | GREEN HILLS TEL. CORP. | 1890 | TINA | MO |
| — | 660-636 | not yet reported which blocks → | GREEN HILLS TEL. CORP. | 1890 | AVALON | MO |
| — | 660-644 | not yet reported which blocks → | GREEN HILLS TEL. CORP. | 1890 | BRECKENRDG | MO |
| — | 660-659 | not yet reported which blocks → | GREEN HILLS TEL. CORP. | 1890 | WHEELING | MO |
| — | 660-731 | not yet reported which blocks → | GREEN HILLS TEL. CORP. | 1890 | BOGARD | MO |
| — | 660-738 | not yet reported which blocks → | GREEN HILLS TEL. CORP. | 1890 | LUDLOW | MO |
| — | 660-745 | not yet reported which blocks → | GREEN HILLS TEL. CORP. | 1890 | DAWN | MO |
| — | 660-755 | not yet reported which blocks → | GREEN HILLS TEL. CORP. | 1890 | MOORESVL | MO |
| — | 660-772 | not yet reported which blocks → | GREEN HILLS TEL. CORP. | 1890 | LOCK SPG | 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.