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 737
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2018-03-22 | 737-471-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | AUSTIN | TX |
| 2018-03-22 | 737-471-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | AUSTIN | TX |
| 2016-11-28 | 737-867-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | AUSTIN | TX |
| 2016-11-28 | 737-867-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | AUSTIN | TX |
| 2016-11-28 | 737-867-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | AUSTIN | TX |
| 2015-05-28 | 737-600-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | AUSTIN | TX |
| 2014-04-11 | 737-888-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | TAYLOR | TX |
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.