NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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 817
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
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Jan 2026
Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2013-02-28 | 817-474-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2011-09-12 | 817-912-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | GRAPEVINE | TX |
| 2011-06-09 | 817-693-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2011-05-27 | 817-388-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | GRAPEVINE | TX |
| 2011-05-27 | 817-388-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | GRAPEVINE | TX |
| 2011-05-27 | 817-388-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | GRAPEVINE | TX |
| 2011-05-27 | 817-388-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | GRAPEVINE | TX |
| 2011-05-27 | 817-388-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | GRAPEVINE | TX |
| 2011-05-27 | 817-388-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | GRAPEVINE | TX |
| 2011-05-27 | 817-388-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | GRAPEVINE | TX |
| 2011-05-27 | 817-388-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | GRAPEVINE | TX |
| 2011-05-27 | 817-388-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | GRAPEVINE | TX |
| 2011-05-27 | 817-388-9XXX | 9000–9999 | Assigned | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | GRAPEVINE | TX |
| 2011-01-04 | 817-826-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2011-01-04 | 817-826-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2011-01-04 | 817-826-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2011-01-04 | 817-826-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2011-01-04 | 817-826-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2009-06-26 | 817-782-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | FORT WORTH | TX |
| 2009-06-19 | 817-916-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | FORT WORTH | TX |
| 2009-03-27 | 817-310-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | GRAPEVINE | TX |
| 2009-02-05 | 817-826-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2008-10-07 | 817-928-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | FORT WORTH | TX |
| 2008-10-07 | 817-928-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | FORT WORTH | TX |
| 2008-10-07 | 817-928-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | FORT WORTH | TX |
| 2008-10-07 | 817-928-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | FORT WORTH | TX |
| 2008-04-21 | 817-760-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | CLEBURNE | TX |
| 2008-04-15 | 817-802-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2008-04-15 | 817-802-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2008-04-15 | 817-802-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2008-04-15 | 817-802-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2008-04-15 | 817-802-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2008-04-15 | 817-802-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2008-04-15 | 817-802-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2008-04-15 | 817-802-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2008-04-15 | 817-802-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2008-04-15 | 817-802-9XXX | 9000–9999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2008-01-23 | 817-539-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | MANSFIELD | TX |
| 2007-08-28 | 817-960-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | ARLINGTON | TX |
| 2007-08-28 | 817-960-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | ARLINGTON | TX |
| 2007-08-28 | 817-960-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | ARLINGTON | TX |
| 2007-08-28 | 817-960-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | ARLINGTON | TX |
| 2007-08-28 | 817-960-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | ARLINGTON | TX |
| 2007-08-28 | 817-960-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | ARLINGTON | TX |
| 2007-08-28 | 817-960-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | ARLINGTON | TX |
| 2007-08-28 | 817-960-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | ARLINGTON | TX |
| 2007-08-28 | 817-960-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | ARLINGTON | TX |
| 2007-08-28 | 817-960-9XXX | 9000–9999 | Assigned | SOUTHWESTERN BELL | 9533 | ARLINGTON | TX |
| 2007-02-02 | 817-826-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
| 2007-02-02 | 817-826-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | ROANOKE | TX |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.