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 |
|---|---|---|---|---|---|---|---|
| 2016-08-15 | 231-444-7XXX | 7000–7999 | Assigned | CLEAR RATE COMMUNICATIONS, LLC | 046L | CADILLAC | MI |
| 2016-08-15 | 231-819-4XXX | 4000–4999 | Assigned | CLEAR RATE COMMUNICATIONS, LLC | 046L | TUSTIN | MI |
| 2016-08-15 | 231-885-7XXX | 7000–7999 | Assigned | CLEAR RATE COMMUNICATIONS, LLC | 046L | MESICK | MI |
| 2016-06-27 | 231-757-7XXX | 7000–7999 | Assigned | CLEAR RATE COMMUNICATIONS, LLC | 046L | SCOTTVILLE | MI |
| 2013-02-22 | 231-256-4XXX | 4000–4999 | Assigned | CLEAR RATE COMMUNICATIONS, LLC | 046L | LKLEELANAU | MI |
| 2012-02-13 | 231-290-7XXX | 7000–7999 | Assigned | CLEAR RATE COMMUNICATIONS, LLC | 046L | INDIAN RIV | MI |
| 2012-02-13 | 231-660-7XXX | 7000–7999 | Assigned | CLEAR RATE COMMUNICATIONS, LLC | 046L | BIG RAPIDS | MI |
| 2012-02-13 | 231-715-7XXX | 7000–7999 | Assigned | CLEAR RATE COMMUNICATIONS, LLC | 046L | TRAVERSECY | MI |
| 2011-06-08 | 231-834-2XXX | 2000–2999 | Assigned | CLEAR RATE COMMUNICATIONS, LLC | 046L | GRANT | MI |
| 2009-05-15 | 231-719-6XXX | 6000–6999 | Assigned | CLEAR RATE COMMUNICATIONS, LLC | 046L | MUSKEGON | 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.