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 |
|---|---|---|---|---|---|---|
| 2024-11-14 | 319-502 | 0–9 XXXall 10 · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | WATERLOO | IA |
| 2023-01-24 | 319-307 | 4XXX7XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | DUNKERTON | IA |
| 2023-01-24 | 319-309 | 7XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | GUERNSEY | IA |
| 2023-01-24 | 319-314 | 5XXX7XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | READLYN | IA |
| 2022-10-26 | 319-306 | 7XXX8XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | JESUP | IA |
| 2021-12-02 | 319-388 | 1XXX3XXX4XXX7XXX8XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | DONNELLSON | IA |
| 2020-09-28 | 319-386 | 2XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | MEDIAPOLIS | IA |
| 2018-06-29 | 319-216 | 2XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | MARTELLE | IA |
| 2018-06-29 | 319-218 | 2XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | OLIN | IA |
| 2018-06-28 | 319-207 | 2XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | MORLEY | IA |
| 2010-11-24 | 319-774 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | CEDAR RPDS | IA |
| 2010-03-11 | 319-820 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | MONTICELLO | IA |
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.