NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026
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 713
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2010-12-16 | 713-836-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-12-16 | 713-836-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-12-16 | 713-836-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-12-16 | 713-836-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-12-16 | 713-836-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-12-15 | 713-396-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-12-15 | 713-396-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-11-12 | 713-909-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| 2010-07-20 | 713-274-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-07-20 | 713-274-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-07-20 | 713-274-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-07-20 | 713-274-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-07-20 | 713-274-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-07-20 | 713-274-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-07-20 | 713-274-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-07-20 | 713-274-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-07-20 | 713-274-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-07-20 | 713-274-9XXX | 9000–9999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-04-06 | 713-338-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-04-06 | 713-338-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-04-06 | 713-338-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2010-04-06 | 713-338-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2009-01-22 | 713-897-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2009-01-22 | 713-897-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2009-01-22 | 713-897-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2009-01-22 | 713-897-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2009-01-22 | 713-897-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2009-01-22 | 713-897-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2008-11-13 | 713-936-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2008-11-13 | 713-936-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2008-09-11 | 713-469-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2008-09-08 | 713-469-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2008-07-02 | 713-251-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2008-07-02 | 713-251-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2008-07-02 | 713-251-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2008-07-02 | 713-251-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2008-07-02 | 713-251-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2008-07-02 | 713-251-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2008-07-02 | 713-251-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2008-07-02 | 713-251-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2008-07-02 | 713-251-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2008-07-02 | 713-251-9XXX | 9000–9999 | Assigned | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| 2008-04-15 | 713-389-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2008-04-15 | 713-389-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2008-04-15 | 713-389-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2008-03-14 | 713-879-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | WESTFIELD | TX |
| 2008-03-14 | 713-879-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | WESTFIELD | TX |
| 2008-03-14 | 713-879-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | WESTFIELD | TX |
| 2008-03-14 | 713-879-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | WESTFIELD | TX |
| 2008-03-14 | 713-879-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | WESTFIELD | TX |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.