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 |
|---|---|---|---|---|---|---|---|
| 2013-05-16 | 586-210-1XXX | 1000–1999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | NEWBALTIMR | MI |
| 2009-05-15 | 586-336-8XXX | 8000–8999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | ROMEO | MI |
| 2009-05-15 | 586-467-3XXX | 3000–3999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | CENTERLINE | MI |
| 2009-05-15 | 586-685-6XXX | 6000–6999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | UTICA | MI |
| 2008-09-17 | 586-275-3XXX | 3000–3999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | WARREN | MI |
| 2008-06-17 | 586-329-2XXX | 2000–2999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | MT CLEMENS | MI |
| 2008-06-12 | 586-218-1XXX | 1000–1999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | ROSEVILLE | MI |
| 2005-12-15 | 586-360-2XXX | 2000–2999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | ROSEVILLE | 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.