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 |
|---|---|---|---|---|---|---|
| 2022-12-15 | 712-394 | 7XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | BELOIT | IA |
| 2022-12-14 | 712-391 | 0XXX7XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | ANTHON | IA |
| 2022-01-26 | 712-671 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | SHENANDOAH | IA |
| 2013-10-01 | 712-745 | 7XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | NO HOPKINS | IA |
| 2008-06-11 | 712-587 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | SIOUX CITY | IA |
| 2008-01-22 | 712-823 | 1XXX2XXX3XXX4XXX5XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | SERGENTBLF | IA |
| 2007-02-23 | 712-631 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | SHELDON | IA |
| 2006-03-07 | 712-560 | 0–9 XXXall 10 · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | SIOUX CITY | IA |
| — | 712-845 | 0XXX1XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | LAURENS | IA |
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.