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 |
|---|---|---|---|---|---|---|
| 2020-04-17 | 612-448 | 0–9 XXXall 10 · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | TWINCITIES | MN |
| 2020-01-17 | 612-446 | 0–9 XXXall 10 · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | TWINCITIES | MN |
| 2016-02-08 | 612-426 | 0–9 XXXall 10 · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | TWINCITIES | MN |
| 2015-09-09 | 612-442 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | TWINCITIES | MN |
| 2006-07-03 | 612-568 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | TWINCITIES | MN |
| 2006-04-20 | 612-424 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | TWINCITIES | MN |
| 2001-08-01 | 612-235 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | TWINCITIES | MN |
| — | 612-225 | 6XXX7XXX8XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | TWINCITIES | MN |
| — | 612-256 | 9XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | TWINCITIES | MN |
| — | 612-260 | 3XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | TWINCITIES | MN |
| — | 612-279 | 7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | TWINCITIES | MN |
| — | 612-284 | 0–9 XXXwhole prefix which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | TWINCITIES | MN |
| — | 612-326 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | TWINCITIES | MN |
| — | 612-392 | 9XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | TWINCITIES | MN |
| — | 612-548 | 0XXX1XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | TWINCITIES | MN |
| — | 612-605 | not yet reported which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | TWINCITIES | MN |
| — | 612-643 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | TWINCITIES | MN |
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.