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 281
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
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Apr 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2017-10-18 | 281-939-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2013-12-13 | 281-206-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | BARKER | TX |
| 2013-11-11 | 281-206-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | BARKER | TX |
| 2013-10-04 | 281-396-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | KATY | TX |
| 2013-10-03 | 281-665-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | KATY | TX |
| 2013-06-03 | 281-206-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | BARKER | TX |
| 2013-04-24 | 281-205-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | TOMBALL | TX |
| 2010-07-22 | 281-717-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | BARKER | TX |
| 2009-07-28 | 281-766-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | PINEHURST | TX |
| 2009-02-24 | 281-949-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | SATSUMA | TX |
| 2009-01-19 | 281-656-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | LANGHAMCRK | TX |
| 2008-10-24 | 281-758-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | CYPRESS | TX |
| 2008-08-25 | 281-944-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | BARKER | TX |
| 2008-08-05 | 281-653-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | SATSUMA | TX |
| 2008-06-23 | 281-826-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | TOMBALL | TX |
| 2008-06-23 | 281-826-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | TOMBALL | TX |
| 2008-02-27 | 281-758-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | CYPRESS | TX |
| 2007-09-07 | 281-203-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2007-09-07 | 281-907-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2007-07-31 | 281-616-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | BARKER | TX |
| 2006-10-02 | 281-907-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2006-03-08 | 281-725-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | RICHMNRNBG | TX |
| 2005-12-12 | 281-758-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | CYPRESS | TX |
| 2005-12-12 | 281-758-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | CYPRESS | TX |
| 2005-12-12 | 281-758-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | CYPRESS | TX |
| 2004-01-22 | 281-231-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | WESTFIELD | TX |
| 2002-10-25 | 281-466-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2002-07-22 | 281-465-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2002-07-22 | 281-465-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| 2002-06-18 | 281-301-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | BAMMEL | TX |
| 2002-06-17 | 281-248-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | BAMMEL | TX |
| 2002-06-17 | 281-248-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | BAMMEL | 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.