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 |
|---|---|---|---|---|---|---|
| — | 641-366 | 0XXX6XXX7XXX8XXX · 4 holders which blocks → | HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA | 1297 | CONRAD | IA |
| — | 641-474 | none assigned yet which blocks → | HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA | 1297 | GREEN MT | IA |
| — | 641-475 | 8XXX which blocks → | HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA | 1297 | HAVERHILL | IA |
| — | 641-476 | 8XXX which blocks → | HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA | 1297 | LAUREL | IA |
| — | 641-478 | 8XXX which blocks → | HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA | 1297 | FERGUSON | IA |
| — | 641-486 | not yet reported which blocks → | HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA | 1297 | UNION | IA |
| — | 641-488 | 8XXX which blocks → | HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA | 1297 | ALBION | IA |
| — | 641-496 | not yet reported which blocks → | HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA | 1297 | LISCOMB | IA |
| — | 641-497 | not yet reported which blocks → | HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA | 1297 | NEWPROVDNC | IA |
| — | 641-858 | 0XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → | HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA | 1297 | ELDORA | IA |
| — | 641-868 | 6XXX8XXX · 2 holders which blocks → | HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA | 1297 | STEAMBOTRK | IA |
| — | 641-920 | not yet reported which blocks → | HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA | 1297 | STEAMBOTRK | IA |
| — | 641-922 | not yet reported which blocks → | HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA | 1297 | CONRAD | IA |
| — | 641-939 | not yet reported which blocks → | HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA | 1297 | ELDORA | 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.