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 |
|---|---|---|---|---|---|---|
| 2018-03-06 | 740-741 | 0XXX1XXX9XXX · 3 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | LTLHOCKING | OH |
| 2015-07-06 | 740-728 | 0XXX2XXX3XXX4XXX7XXX9XXX · 4 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | COOLVILLE | OH |
| 2015-07-06 | 740-799 | 0XXX1XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | QUAKERCITY | OH |
| 2015-07-06 | 740-898 | 1XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | POWHATANPT | OH |
| 2015-07-06 | 740-955 | 1XXX2XXX5XXX8XXX9XXX · 4 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | CUMBERLAND | OH |
| 2015-06-25 | 740-866 | 0XXX1XXX6XXX9XXX · 4 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | BLOOMINGDL | OH |
| 2013-06-06 | 740-916 | 5XXX7XXX8XXX · 3 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | FAIRVIEW | OH |
| 2001-06-26 | 740-570 | 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | CHESTER | OH |
| — | 740-378 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | COOLVILLE | OH |
| — | 740-489 | 6XXX7XXX8XXX · 3 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | OLDWSHNGTN | OH |
| — | 740-638 | 0XXX7XXX · 2 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | CUMBERLAND | OH |
| — | 740-667 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | COOLVILLE | OH |
| — | 740-679 | 6XXX7XXX8XXX · 2 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | QUAKERCITY | OH |
| — | 740-686 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | CENTERVL | OH |
| — | 740-758 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | FAIRVIEW | OH |
| — | 740-782 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | MORRISTOWN | OH |
| — | 740-795 | 8XXX which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | POWHATANPT | OH |
| — | 740-937 | 6XXX7XXX8XXX · 3 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | HOPEDALE | OH |
| — | 740-944 | 4XXX7XXX · 2 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | BLOOMINGDL | OH |
| — | 740-985 | not yet reported which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | CHESTER | OH |
| — | 740-989 | 3XXX4XXX · 2 holders which blocks → | WINDSTREAM WESTERN RESERVE, INC. | 0666 | LTLHOCKING | 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.