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 |
|---|---|---|---|---|---|---|
| 2010-02-02 | 330-888 | 0–9 XXXall 10 · 4 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | TWINSBURG | OH |
| 2007-04-18 | 330-954 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | AURORA | OH |
| 2002-07-08 | 330-523 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | RICHFIELD | OH |
| — | 330-278 | 0XXX1XXX6XXX8XXX · 3 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | HINCKLEY | OH |
| — | 330-342 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | HUDSON | OH |
| — | 330-405 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | TWINSBURG | OH |
| — | 330-425 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | TWINSBURG | OH |
| — | 330-463 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | NORTHFIELD | OH |
| — | 330-467 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | NORTHFIELD | OH |
| — | 330-468 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | NORTHFIELD | OH |
| — | 330-486 | 5XXX7XXX8XXX · 3 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | TWINSBURG | OH |
| — | 330-487 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | TWINSBURG | OH |
| — | 330-528 | 7XXX which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | NORTHFIELD | OH |
| — | 330-562 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | AURORA | OH |
| — | 330-569 | 4XXX8XXX which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | HIRAM | OH |
| — | 330-650 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | HUDSON | OH |
| — | 330-653 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | HUDSON | OH |
| — | 330-655 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | HUDSON | OH |
| — | 330-656 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | NORTHFIELD | OH |
| — | 330-657 | 0XXX4XXX7XXX8XXX · 4 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | PENINSULA | OH |
| — | 330-659 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | RICHFIELD | OH |
| — | 330-908 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | NORTHFIELD | OH |
| — | 330-963 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | TWINSBURG | OH |
| — | 330-995 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | AURORA | OH |
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.