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 |
|---|---|---|---|---|---|---|
| 2026-06-24 | 534-255 | 7XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | ARKANSAW | WI |
| 2026-06-24 | 534-256 | 7XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | EAU GALLE | WI |
| 2022-07-13 | 534-206 | 4XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | BAY CITY | WI |
| 2022-02-04 | 534-209 | 4XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | SPRINGLAKE | WI |
| 2017-10-25 | 534-201 | 1XXX7XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | CAMERON | WI |
| 2017-10-25 | 534-238 | 7XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | DRUMMOND | WI |
| 2017-10-25 | 534-239 | 7XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | GRANDVIEW | WI |
| 2017-10-25 | 534-313 | 3XXX7XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | LA POINTE | WI |
| 2017-10-25 | 534-331 | 1XXX7XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | IRON RIVER | WI |
| 2017-10-25 | 534-421 | 7XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | MARENGO | WI |
| 2017-10-11 | 534-252 | 2XXX5XXX7XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | CABLE | WI |
| 2017-10-11 | 534-259 | 6XXX7XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | BENOIT | WI |
| 2017-10-11 | 534-322 | 2XXX7XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | CORNUCOPIA | WI |
| 2017-10-11 | 534-438 | 7XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | BARNES | WI |
| 2015-06-18 | 534-219 | 0XXX7XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | CANTON | WI |
| 2015-06-18 | 534-229 | 7XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | LONG LAKE | WI |
| 2015-06-18 | 534-321 | 0XXX7XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | NEW AUBURN | WI |
| 2014-11-18 | 534-248 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | RIVERFALLS | WI |
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.