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 |
|---|---|---|---|---|---|---|
| 2017-07-19 | 775-381 | 7XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | LEE JIGGS | NV |
| 2017-07-19 | 775-394 | 7XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | MONTELLO | NV |
| 2017-07-19 | 775-396 | 7XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | RUBYVALLEY | NV |
| 2017-06-22 | 775-380 | 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | SILVERPEAK | NV |
| 2017-02-14 | 775-395 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | RENO | NV |
| 2015-10-07 | 775-507 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | RENO | NV |
| 2012-02-17 | 775-405 | 0–9 XXXall 10 · 8 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | ELY | NV |
| 2011-12-14 | 775-360 | 0–9 XXXall 10 · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | RENO | NV |
| 2007-03-22 | 775-401 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | ELKO | NV |
| 2005-11-23 | 775-473 | 0–9 XXXall 10 · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | RENO | NV |
| 2005-07-25 | 775-299 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | ELKO | NV |
| 2005-07-07 | 775-909 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | SILVER SPG | NV |
| 2005-05-31 | 775-229 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | RENO | NV |
| 2005-05-31 | 775-990 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | PAHRUMP | NV |
| 2002-11-13 | 775-364 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | GARDNERVL | NV |
| — | 775-319 | 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | FISHLK VLY | NV |
| — | 775-344 | 1XXX3XXX4XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | YERINGTON | NV |
| — | 775-539 | 1XXX2XXX4XXX5XXX6XXX7XXX8XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | BATTLE MT | NV |
| — | 775-548 | 1XXX3XXX4XXX5XXX6XXX7XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | CRYSTALBAY | NV |
| — | 775-554 | 1XXX4XXX5XXX6XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | GLENBROOK | NV |
| — | 775-556 | 5XXX6XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | MONTGYPASS | NV |
| — | 775-581 | 1XXX2XXX3XXX4XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | TOPAZ LAKE | NV |
| — | 775-583 | 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | VIRGINIACY | NV |
| — | 775-627 | 0XXX4XXX5XXX6XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | YERINGTON | NV |
| — | 775-979 | 1XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | LOVELOCK | NV |
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.