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 |
|---|---|---|---|---|---|---|
| 2024-03-05 | 563-218 | 7XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | WILTON | IA |
| 2022-01-26 | 563-351 | 1XXX3XXX4XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | DURANT | IA |
| 2018-06-28 | 563-236 | 2XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | ANDREW | IA |
| 2018-06-28 | 563-240 | 2XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | LAMOTTE | IA |
| 2018-06-28 | 563-266 | 2XXX5XXX6XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | BERNARD | IA |
| 2018-06-28 | 563-268 | 2XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | BALDWIN | IA |
| 2018-06-28 | 563-269 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | CASCADE | IA |
| 2018-06-28 | 563-270 | 0XXX2XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | CENTER JCT | IA |
| 2018-06-28 | 563-273 | 2XXX3XXX6XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | ONSLOW | IA |
| 2018-06-28 | 563-274 | 2XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | OTTERCREEK | IA |
| 2009-11-24 | 563-265 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | DAVENPORT | IA |
| 2009-10-26 | 563-217 | 0–9 XXXall 10 · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | WAUKON | 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.