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 |
|---|---|---|---|---|---|---|
| 2011-11-14 | 501-331 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | PERRYVILLE | AR |
| 2011-11-14 | 501-402 | 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 6 holders which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | GREENBRIER | AR |
| 2008-03-27 | 501-287 | 0–9 XXXall 10 · 5 holders which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | GREENBRIER | AR |
| 2001-06-25 | 501-391 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | PERRYVILLE | AR |
| — | 501-330 | 0XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | WYE | AR |
| — | 501-333 | 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | MAUMELLE | AR |
| — | 501-335 | 2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | DAMASCUS | AR |
| — | 501-432 | 2XXX3XXX4XXX7XXX9XXX · 4 holders which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | NIMROD | AR |
| — | 501-440 | 4XXX5XXX7XXX8XXX · 4 holders which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | SO FOURCHE | AR |
| — | 501-556 | 7XXX which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | ROSE BUD | AR |
| — | 501-581 | 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | GREENBRIER | AR |
| — | 501-589 | 7XXX which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | QUITMAN | AR |
| — | 501-654 | none assigned yet which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | MORGANTON | AR |
| — | 501-662 | 3XXX6XXX7XXX8XXX · 4 holders which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | PERRY | AR |
| — | 501-679 | not yet reported which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | GREENBRIER | AR |
| — | 501-728 | 1XXX which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | PANGBURN | AR |
| — | 501-759 | 5XXX6XXX7XXX8XXX · 3 holders which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | BIGELOW | AR |
| — | 501-796 | 1XXX9XXX · 2 holders which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | VILONIA | AR |
| — | 501-849 | 5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | ENOLA | AR |
| — | 501-889 | 9XXX which blocks → | WINDSTREAM ARKANSAS, INC. | 1691 | PERRYVILLE | AR |
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.