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 |
|---|---|---|---|---|---|---|
| — | 586-308 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | ROSEVILLE | MI |
| — | 586-309 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | ROSEVILLE | MI |
| — | 586-319 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | WARREN | MI |
| — | 586-380 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | ROMEO | MI |
| — | 586-402 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | WARREN | MI |
| — | 586-406 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | WARREN | MI |
| — | 586-418 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | WARREN | MI |
| — | 586-450 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | MT CLEMENS | MI |
| — | 586-451 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | ROSEVILLE | MI |
| — | 586-485 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | MT CLEMENS | MI |
| — | 586-507 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | WARREN | MI |
| — | 586-568 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | WARREN | MI |
| — | 586-681 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | MT CLEMENS | MI |
| — | 586-704 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | MT CLEMENS | MI |
| — | 586-708 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | WARREN | MI |
| — | 586-717 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | WARREN | MI |
| — | 586-830 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | WARREN | MI |
| — | 586-831 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | WARREN | MI |
| — | 586-832 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | WARREN | MI |
| — | 586-856 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | UTICA | MI |
| — | 586-870 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | NEWBALTIMR | MI |
| — | 586-896 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | WARREN | MI |
| — | 586-898 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | WARREN | MI |
| — | 586-912 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | WARREN | MI |
| — | 586-916 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | WARREN | MI |
| — | 586-974 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | WARREN | MI |
| — | 586-975 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | MT CLEMENS | MI |
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.