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 | 806-583 | 0–9 XXXall 10 · 6 holders which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | TULIA | TX |
| 2017-11-13 | 806-574 | 1XXX9XXX · 2 holders which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | FRITCH | TX |
| 2017-10-11 | 806-436 | 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | DIMMITT | TX |
| 2004-08-09 | 806-399 | 3XXX which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | DUMAS | TX |
| — | 806-235 | none assigned yet which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | CHANNING | TX |
| — | 806-267 | none assigned yet which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | VEGA | TX |
| — | 806-365 | none assigned yet which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | HARTLEY | TX |
| — | 806-426 | none assigned yet which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | WILDORADO | TX |
| — | 806-534 | none assigned yet which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | BOYS RANCH | TX |
| — | 806-538 | none assigned yet which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | ADRIAN | TX |
| — | 806-647 | not yet reported which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | DIMMITT | TX |
| — | 806-857 | 8XXX which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | FRITCH | TX |
| — | 806-865 | not yet reported which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | SANFORD | TX |
| — | 806-934 | not yet reported which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | DUMAS | TX |
| — | 806-935 | not yet reported which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | DUMAS | TX |
| — | 806-938 | not yet reported which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | HART | TX |
| — | 806-945 | not yet reported which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | NAZARETH | TX |
| — | 806-948 | none assigned yet which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | SUNRAY | TX |
| — | 806-966 | none assigned yet which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | CACTUS | TX |
| — | 806-995 | 6XXX which blocks → | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | TULIA | TX |
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.