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 |
|---|---|---|---|---|---|---|
| 2017-12-13 | 539-221 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW | 1165 | HASKELL | OK |
| 2016-12-30 | 539-209 | 0–9 XXXall 10 · 5 holders which blocks → | VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW | 1165 | WAGONER | OK |
| 2016-07-12 | 539-200 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW | 1165 | BARNSDALL | OK |
| 2016-07-12 | 539-203 | 0–9 XXXall 10 · 3 holders which blocks → | VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW | 1165 | STROUD | OK |
| — | 539-214 | 0–9 XXXall 10 · 5 holders which blocks → | VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW | 1165 | FAIRFAX | OK |
| — | 539-321 | 0XXX2XXX3XXX5XXX8XXX9XXX · 4 holders which blocks → | VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW | 1165 | MORRIS | OK |
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.