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 346
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2017-07-18 | 346-265-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2017-07-18 | 346-265-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2017-07-18 | 346-265-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2017-07-18 | 346-265-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2017-07-18 | 346-265-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2017-04-11 | 346-286-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2017-04-11 | 346-286-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2017-04-11 | 346-286-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2017-04-11 | 346-286-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2017-04-11 | 346-286-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2017-04-11 | 346-286-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2017-04-11 | 346-286-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2017-04-11 | 346-286-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2017-04-11 | 346-286-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2017-04-11 | 346-286-9XXX | 9000–9999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2017-03-29 | 346-246-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | TOMBALL | TX |
| 2017-02-02 | 346-843-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | RICHMNRNBG | TX |
| 2016-02-12 | 346-239-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | RICHMNRNBG | TX |
| 2015-09-14 | 346-971-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2015-05-07 | 346-305-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2015-05-07 | 346-305-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2015-05-07 | 346-305-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2015-03-13 | 346-206-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | SATSUMA | TX |
| 2014-12-16 | 346-207-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| 2014-02-27 | 346-720-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-720-9XXX | 9000–9999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-721-9XXX | 9000–9999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-722-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-722-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-722-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-722-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-722-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2014-02-27 | 346-722-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | 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.