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 |
|---|---|---|---|---|---|---|
| 2012-12-19 | 320-317 | 0–9 XXXall 10 · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | OGILVIE | MN |
| 2005-03-30 | 320-377 | 1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | GROVE CITY | MN |
| 2005-02-22 | 320-432 | 2XXX3XXX4XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | HOLMESCITY | MN |
| 2004-12-28 | 320-526 | 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | HOWARDLAKE | MN |
| 2004-12-28 | 320-626 | 0–9 XXXall 10 · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | DASSEL | MN |
| 2004-12-09 | 320-434 | 0–9 XXXall 10 · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | LITCHFIELD | MN |
| 2004-11-30 | 320-433 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | ST JOSEPH | MN |
| 2004-07-15 | 320-300 | 0–9 XXXall 10 · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | GLENCOE | MN |
| 2004-06-08 | 320-338 | 3XXX7XXX8XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | GRANITEFLS | MN |
| 2004-04-06 | 320-357 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 8 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | LONGPRAIRI | MN |
| 2003-09-22 | 320-315 | 0XXX1XXX3XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | GRANITEFLS | MN |
| 2003-04-30 | 320-649 | 9XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | BIRDISLAND | MN |
| 2002-11-13 | 320-299 | 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | COKATO | MN |
| 2002-11-13 | 320-332 | 7XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | GLENCOE | MN |
| 2002-09-24 | 320-227 | 2XXX3XXX4XXX6XXX8XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | ST CLOUD | MN |
| 2002-07-29 | 320-244 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | GROVE CITY | MN |
| 2002-07-29 | 320-270 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | HOLMESCITY | MN |
| 2002-07-16 | 320-591 | 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | PINE CITY | MN |
| 2002-05-08 | 320-322 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | PINE CITY | MN |
| 2002-04-29 | 320-310 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | ST CLOUD | MN |
| 2001-11-16 | 320-421 | not yet reported which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | ALEXANDRIA | MN |
| 2001-06-12 | 320-281 | 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | ST CLOUD | MN |
| — | 320-209 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | MORA | 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.