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 |
|---|---|---|---|---|---|---|
| 2023-01-18 | 531-315 | 0XXX2XXX6XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NE | 3233 | BLAIR | NE |
| 2023-01-03 | 531-307 | 1XXX8XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NE | 3233 | HOMER | NE |
| 2023-01-03 | 531-314 | 0XXX1XXX2XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NE | 3233 | W HAMBURG | NE |
| 2022-12-14 | 531-306 | 0XXX1XXX7XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NE | 3233 | MURRAY | NE |
| 2022-11-16 | 531-305 | 0XXX1XXX3XXX5XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NE | 3233 | HICKMAN | NE |
| 2022-11-09 | 531-295 | 0XXX1XXX2XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NE | 3233 | LAUREL | NE |
| 2022-08-09 | 531-286 | 0XXX1XXX2XXX4XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NE | 3233 | OAKLAND | NE |
| 2021-05-03 | 531-268 | 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NE | 3233 | ATKINSON | NE |
| 2021-02-09 | 531-559 | 0–9 XXXall 10 · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NE | 3233 | OMAHA | NE |
| 2018-03-07 | 531-484 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NE | 3233 | OMAHA | NE |
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.