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 |
|---|---|---|---|---|---|---|
| 2025-05-22 | 507-651 | 0–9 XXXwhole prefix which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | ROCHESTER | MN |
| 2022-06-10 | 507-892 | 6XXX7XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | PINEISLAND | MN |
| 2017-05-03 | 507-480 | 0–9 XXXall 10 · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | KIESTER | MN |
| 2017-04-11 | 507-699 | 0XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | GLENVILLE | MN |
| 2005-09-15 | 507-550 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | ST PETER | MN |
| 2005-08-12 | 507-873 | 0–9 XXXall 10 · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | SLAYTON | MN |
| 2005-08-11 | 507-788 | 9XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | ODIN | MN |
| 2005-08-11 | 507-936 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | LAKEFIELD | MN |
| 2005-02-08 | 507-656 | 2XXX4XXX5XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | WALDORF | MN |
| 2004-06-16 | 507-489 | 0XXX1XXX2XXX7XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | WALDORF | MN |
| 2004-05-04 | 507-242 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | BLOOMNPRRI | MN |
| 2002-06-26 | 507-201 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | WASECA | MN |
| 2002-06-26 | 507-205 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | WINONA | MN |
| 2002-05-20 | 507-216 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | ROCHESTER | MN |
| 2002-05-02 | 507-573 | 1XXX2XXX3XXX5XXX6XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | OWATONNA | MN |
| — | 507-307 | 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | HAYFIELD | MN |
| — | 507-416 | 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | ELLENDALE | 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.