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 517
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-07-03 | 517-680-2XXX | 2000–2999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | ALBION | MI |
| 2010-06-09 | 517-748-4XXX | 4000–4999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | JACKSON | MI |
| 2009-12-14 | 517-213-2XXX | 2000–2999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | CHARLOTTE | MI |
| 2009-05-14 | 517-348-1XXX | 1000–1999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | LANSING | MI |
| 2009-01-20 | 517-883-0XXX | 0000–0999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | MASON | MI |
| 2008-08-19 | 517-554-3XXX | 3000–3999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | ALBION | MI |
| 2008-06-27 | 517-579-1XXX | 1000–1999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | HOWELL | 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.