NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.
Most active assignees, all time — NPA 586
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2014-05-30 | 586-997-8XXX | 8000–8999 | Assigned | 123.NET, LLC | 2550 | UTICA | MI |
| 2013-05-20 | 586-825-9XXX | 9000–9999 | Assigned | 123.NET, LLC | 2550 | WARREN | MI |
| 2008-02-12 | 586-416-9XXX | 9000–9999 | Assigned | 123.NET, LLC | 2550 | MT CLEMENS | MI |
| 2005-08-05 | 586-218-6XXX | 6000–6999 | Assigned | 123.NET, LLC | 2550 | ROSEVILLE | MI |
| 2005-08-05 | 586-339-3XXX | 3000–3999 | Assigned | 123.NET, LLC | 2550 | NEW HAVEN | MI |
| 2005-08-05 | 586-473-0XXX | 0000–0999 | Assigned | 123.NET, LLC | 2550 | ARMADA | MI |
| 2005-08-05 | 586-501-3XXX | 3000–3999 | Assigned | 123.NET, LLC | 2550 | CENTERLINE | MI |
| 2005-08-05 | 586-935-1XXX | 1000–1999 | Assigned | 123.NET, LLC | 2550 | WASHINGTON | MI |
| 2003-02-19 | 586-273-2XXX | 2000–2999 | Assigned | 123.NET, LLC | 2550 | NEWBALTIMR | MI |
| 2003-02-19 | 586-580-0XXX | 0000–0999 | Assigned | 123.NET, LLC | 2550 | UTICA | MI |
| 2003-01-02 | 586-354-2XXX | 2000–2999 | Assigned | 123.NET, LLC | 2550 | WARREN | MI |
| 2003-01-02 | 586-430-0XXX | 0000–0999 | Assigned | 123.NET, LLC | 2550 | RICHMOND | MI |
| 2003-01-02 | 586-453-0XXX | 0000–0999 | Assigned | 123.NET, LLC | 2550 | ROMEO | MI |
| 2003-01-02 | 586-649-2XXX | 2000–2999 | Assigned | 123.NET, LLC | 2550 | MT CLEMENS | MI |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.