NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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 |
|---|---|---|---|---|---|---|
| 2024-01-17 | 531-357 | 0XXX1XXX5XXX7XXX · 4 holders which blocks → | COMMIO, LLC | 939H | AINSWORTH | NE |
| 2023-08-22 | 531-343 | 0XXX1XXX2XXX3XXX4XXX7XXX · 2 holders which blocks → | COMMIO, LLC | 939H | CRESTON | NE |
| 2023-08-10 | 531-340 | 0XXX1XXX2XXX3XXX4XXX7XXX · 2 holders which blocks → | COMMIO, LLC | 939H | CLARKSON | NE |
| 2023-03-07 | 531-330 | 0XXX1XXX3XXX5XXX · 4 holders which blocks → | COMMIO, LLC | 939H | WAYNE | NE |
| 2022-11-09 | 531-302 | 0XXX1XXX2XXX3XXX5XXX8XXX · 4 holders which blocks → | COMMIO, LLC | 939H | TECUMSEH | NE |
| 2022-04-04 | 531-310 | 0–9 XXXall 10 · 5 holders which blocks → | COMMIO, LLC | 939H | LINCOLN | NE |
| 2019-06-20 | 531-867 | 0–9 XXXall 10 · 6 holders which blocks → | COMMIO, LLC | 939H | OMAHA | NE |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.