NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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 |
|---|---|---|---|---|---|---|
| 2017-06-01 | 740-723 | 9XXX which blocks → | WINDSTREAM OHIO, LLC | 0665 | GRATIOT | OH |
| 2010-03-11 | 740-755 | 0–9 XXXall 10 · 4 holders which blocks → | WINDSTREAM OHIO, LLC | 0665 | NEWARK | OH |
| — | 740-321 | not yet reported which blocks → | WINDSTREAM OHIO, LLC | 0665 | GRANVILLE | OH |
| — | 740-322 | 4XXX which blocks → | WINDSTREAM OHIO, LLC | 0665 | NEWARK | OH |
| — | 740-323 | 6XXX7XXX · 2 holders which blocks → | WINDSTREAM OHIO, LLC | 0665 | NEWARK | OH |
| — | 740-328 | 7XXX9XXX which blocks → | WINDSTREAM OHIO, LLC | 0665 | NEWARK | OH |
| — | 740-344 | not yet reported which blocks → | WINDSTREAM OHIO, LLC | 0665 | NEWARK | OH |
| — | 740-345 | not yet reported which blocks → | WINDSTREAM OHIO, LLC | 0665 | NEWARK | OH |
| — | 740-348 | 5XXX6XXX8XXX9XXX · 4 holders which blocks → | WINDSTREAM OHIO, LLC | 0665 | NEWARK | OH |
| — | 740-349 | not yet reported which blocks → | WINDSTREAM OHIO, LLC | 0665 | NEWARK | OH |
| — | 740-364 | 8XXX which blocks → | WINDSTREAM OHIO, LLC | 0665 | NEWARK | OH |
| — | 740-366 | not yet reported which blocks → | WINDSTREAM OHIO, LLC | 0665 | NEWARK | OH |
| — | 740-522 | not yet reported which blocks → | WINDSTREAM OHIO, LLC | 0665 | NEWARK | OH |
| — | 740-587 | not yet reported which blocks → | WINDSTREAM OHIO, LLC | 0665 | GRANVILLE | OH |
| — | 740-670 | none assigned yet which blocks → | WINDSTREAM OHIO, LLC | 0665 | NEWARK | OH |
| — | 740-745 | 0XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → | WINDSTREAM OHIO, LLC | 0665 | ST LOUISVL | OH |
| — | 740-763 | 5XXX6XXX7XXX8XXX · 4 holders which blocks → | WINDSTREAM OHIO, LLC | 0665 | HANOVER | OH |
| — | 740-787 | 0XXX3XXX4XXX5XXX6XXX7XXX · 6 holders which blocks → | WINDSTREAM OHIO, LLC | 0665 | GRATIOT | OH |
| — | 740-788 | 2XXX which blocks → | WINDSTREAM OHIO, LLC | 0665 | NEWARK | OH |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.