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 972
New assignments by month
Sep 2026
Aug 2026
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Jun 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-12-12 | 972-348-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DALLAS | TX |
| 2014-08-08 | 972-649-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ALLEN | TX |
| 2013-10-31 | 972-637-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CEDAR HILL | TX |
| 2011-12-29 | 972-629-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DALLAS | TX |
| 2011-06-27 | 972-349-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DALLAS | TX |
| 2011-04-20 | 972-773-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DALLAS | TX |
| 2011-03-09 | 972-850-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DALLAS | TX |
| 2011-03-09 | 972-913-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DALLAS | TX |
| 2011-02-18 | 972-920-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DE SOTO | TX |
| 2010-11-05 | 972-472-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CRANDALL | TX |
| 2010-11-05 | 972-474-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | COMBINE | TX |
| 2010-11-05 | 972-734-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PRINCETON | TX |
| 2010-11-05 | 972-784-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FARMERSVL | TX |
| 2010-11-05 | 972-876-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ENNIS | TX |
| 2010-09-01 | 972-803-1XXX | 1000–1999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DALLAS | TX |
| 2010-09-01 | 972-803-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DALLAS | TX |
| 2010-07-26 | 972-803-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DALLAS | TX |
| 2010-06-29 | 972-854-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | GRANDPRARI | TX |
| 2010-05-19 | 972-803-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DALLAS | TX |
| 2010-03-08 | 972-332-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ALLEN | TX |
| 2010-02-18 | 972-803-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DALLAS | TX |
| 2010-02-18 | 972-803-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DALLAS | TX |
| 2009-12-15 | 972-863-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DALLAS | TX |
| 2009-12-15 | 972-863-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DALLAS | TX |
| 2009-11-03 | 972-292-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FRISCO | TX |
| 2009-11-03 | 972-863-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DALLAS | TX |
| 2009-07-15 | 972-695-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CARROLLTON | TX |
| 2009-06-04 | 972-863-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DALLAS | TX |
| 2006-11-09 | 972-210-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | TERRELL | TX |
| 2006-11-09 | 972-357-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FORNEY | TX |
| 2006-06-09 | 972-639-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | GRANDPRARI | TX |
| 2006-05-16 | 972-637-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CEDAR HILL | TX |
| 2006-03-09 | 972-369-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MCKINNEY | TX |
| 2006-03-09 | 972-748-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DE SOTO | TX |
| 2006-03-09 | 972-954-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ALLEN | TX |
| 2005-08-31 | 972-704-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FRISCO | 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.