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 |
|---|---|---|---|---|---|---|
| 2010-10-14 | 575-263 | 0–9 XXXall 10 · 4 holders which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | HOBBS | NM |
| — | 575-234 | not yet reported which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | CARLSBAD | NM |
| — | 575-236 | 4XXX which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | CARLSBAD | NM |
| — | 575-337 | not yet reported which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | HOBBS | NM |
| — | 575-391 | not yet reported which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | HOBBS | NM |
| — | 575-392 | not yet reported which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | HOBBS | NM |
| — | 575-393 | not yet reported which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | HOBBS | NM |
| — | 575-394 | 8XXX which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | EUNICE | NM |
| — | 575-395 | 6XXX7XXX which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | JAL | NM |
| — | 575-396 | not yet reported which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | LOVINGTON | NM |
| — | 575-397 | not yet reported which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | HOBBS | NM |
| — | 575-492 | not yet reported which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | HOBBS | NM |
| — | 575-628 | not yet reported which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | CARLSBAD | NM |
| — | 575-738 | not yet reported which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | HOBBS | NM |
| — | 575-745 | 8XXX which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | LOVING | NM |
| — | 575-785 | none assigned yet which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | CRLSBACRNS | NM |
| — | 575-885 | not yet reported which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | CARLSBAD | NM |
| — | 575-887 | not yet reported which blocks → | VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | 1164 | CARLSBAD | NM |
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.