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 307
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-10-15 | 307-209-6XXX | 6000–6999 | Assigned | QWEST CORPORATION | 9636 | ROCK SPG | WY |
| 2010-05-20 | 307-212-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | ROCK SPG | WY |
| 2009-02-02 | 307-433-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | CHEYENNE | WY |
| 2008-09-02 | 307-922-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | ROCK SPG | WY |
| 2008-03-13 | 307-253-1XXX | 1000–1999 | Assigned | QWEST CORPORATION | 9636 | CASPER | WY |
| 2008-03-13 | 307-253-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | CASPER | WY |
| 2008-03-13 | 307-253-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | CASPER | WY |
| 2008-03-13 | 307-253-4XXX | 4000–4999 | Assigned | QWEST CORPORATION | 9636 | CASPER | WY |
| 2008-03-13 | 307-253-5XXX | 5000–5999 | Assigned | QWEST CORPORATION | 9636 | CASPER | WY |
| 2008-03-13 | 307-253-6XXX | 6000–6999 | Assigned | QWEST CORPORATION | 9636 | CASPER | WY |
| 2007-12-27 | 307-670-6XXX | 6000–6999 | Assigned | QWEST CORPORATION | 9636 | GILLETTE | WY |
| 2007-03-22 | 307-922-5XXX | 5000–5999 | Assigned | QWEST CORPORATION | 9636 | ROCK SPG | WY |
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.