NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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 231
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2006-05-26 | 231-769-4XXX | 4000–4999 | Assigned | CYNERGYCOMM.NET, INC. - MI | 9245 | MUSKEGON | MI |
| 2006-01-18 | 231-384-4XXX | 4000–4999 | Assigned | CYNERGYCOMM.NET, INC. - MI | 9245 | KALKASKA | MI |
| 2005-07-29 | 231-846-2XXX | 2000–2999 | Assigned | CYNERGYCOMM.NET, INC. - MI | 9245 | CADILLAC | MI |
| 2005-07-29 | 231-887-3XXX | 3000–3999 | Assigned | CYNERGYCOMM.NET, INC. - MI | 9245 | MANISTEE | MI |
| 2005-07-29 | 231-928-6XXX | 6000–6999 | Assigned | CYNERGYCOMM.NET, INC. - MI | 9245 | FREMONT | MI |
| 2005-02-07 | 231-333-3XXX | 3000–3999 | Assigned | CYNERGYCOMM.NET, INC. - MI | 9245 | CHEBOYGAN | MI |
| 2005-02-07 | 231-459-1XXX | 1000–1999 | Assigned | CYNERGYCOMM.NET, INC. - MI | 9245 | BOYNE CITY | MI |
| 2004-05-27 | 231-758-3XXX | 3000–3999 | Assigned | CYNERGYCOMM.NET, INC. - MI | 9245 | PETOSKEY | MI |
| 2004-02-02 | 231-944-1XXX | 1000–1999 | Assigned | CYNERGYCOMM.NET, INC. - MI | 9245 | TRAVERSECY | MI |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.