NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026
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 330
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2012-03-14 | 330-888-6XXX | 6000–6999 | Assigned | WINDSTREAM WESTERN RESERVE, INC. | 0666 | TWINSBURG | OH |
| 2010-02-03 | 330-888-4XXX | 4000–4999 | Assigned | WINDSTREAM WESTERN RESERVE, INC. | 0666 | TWINSBURG | OH |
| 2009-11-19 | 330-523-4XXX | 4000–4999 | Assigned | WINDSTREAM WESTERN RESERVE, INC. | 0666 | RICHFIELD | OH |
| 2009-01-27 | 330-954-7XXX | 7000–7999 | Assigned | WINDSTREAM WESTERN RESERVE, INC. | 0666 | AURORA | OH |
| 2008-06-02 | 330-954-2XXX | 2000–2999 | Assigned | WINDSTREAM WESTERN RESERVE, INC. | 0666 | AURORA | OH |
| 2007-05-01 | 330-954-1XXX | 1000–1999 | Assigned | WINDSTREAM WESTERN RESERVE, INC. | 0666 | AURORA | OH |
| 2003-04-22 | 330-523-3XXX | 3000–3999 | Assigned | WINDSTREAM WESTERN RESERVE, INC. | 0666 | RICHFIELD | OH |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.