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 |
|---|---|---|---|---|---|---|
| 2026-04-23 | 575-350 | 7XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NM | 5470 | ROY | NM |
| 2021-09-13 | 575-292 | 0XXX2XXX5XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NM | 5470 | TIERRAAMRL | NM |
| 2014-09-15 | 575-288 | 0–9 XXXall 10 · 8 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NM | 5470 | LAS CRUCES | NM |
| 2013-03-26 | 575-265 | 0–9 XXXall 10 · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NM | 5470 | CLOVIS | NM |
| 2013-03-26 | 575-449 | 0–9 XXXall 10 · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NM | 5470 | LAS CRUCES | NM |
| 2012-03-05 | 575-424 | 2XXX4XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NM | 5470 | VIRDEN | NM |
| 2008-10-20 | 575-300 | 0–9 XXXall 10 · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NM | 5470 | LA MESA | NM |
| 2004-11-11 | 575-201 | 0–9 XXXall 10 · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NM | 5470 | ANTHONY | NM |
| 2002-05-16 | 575-578 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NM | 5470 | ROSWELL | NM |
| 2002-05-02 | 575-613 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NM | 5470 | TAOS | NM |
| 2002-05-01 | 575-635 | 0–9 XXXall 10 · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NM | 5470 | LAS CRUCES | NM |
| — | 575-208 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NM | 5470 | ROSWELL | NM |
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.