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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-07-07 | 281-315-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BAMMEL | TX |
| 2014-06-09 | 281-771-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SPRING | TX |
| 2013-07-18 | 281-965-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HSTNSUBURB | TX |
| 2011-12-21 | 281-869-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WESTFIELD | TX |
| 2011-06-06 | 281-204-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | APOLLO | TX |
| 2011-01-07 | 281-533-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | VLY LODGE | TX |
| 2011-01-07 | 281-783-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SHELDON | TX |
| 2011-01-07 | 281-942-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SEABROOK | TX |
| 2010-09-03 | 281-758-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CYPRESS | TX |
| 2010-08-24 | 281-829-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BARKER | TX |
| 2010-04-20 | 281-815-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LANGHAMCRK | TX |
| 2010-04-13 | 281-836-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BAMMEL | TX |
| 2010-02-19 | 281-653-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SATSUMA | TX |
| 2009-12-15 | 281-676-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BARKER | TX |
| 2009-12-15 | 281-846-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HOUSTON | TX |
| 2009-12-11 | 281-746-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CYPRESS | TX |
| 2009-12-01 | 281-809-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HSTNSUBURB | TX |
| 2009-11-03 | 281-815-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LANGHAMCRK | TX |
| 2009-09-18 | 281-809-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HSTNSUBURB | TX |
| 2009-09-17 | 281-826-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | TOMBALL | TX |
| 2009-05-18 | 281-809-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HSTNSUBURB | TX |
| 2006-11-14 | 281-982-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WESTFIELD | TX |
| 2006-06-15 | 281-323-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SPRING | TX |
| 2006-06-09 | 281-547-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | TOMBALL | TX |
| 2006-06-09 | 281-653-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SATSUMA | TX |
| 2006-06-09 | 281-836-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BAMMEL | TX |
| 2006-03-09 | 281-676-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BARKER | TX |
| 2006-03-09 | 281-815-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LANGHAMCRK | TX |
| 2006-02-01 | 281-245-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ALVIN | TX |
| 2006-02-01 | 281-402-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LA PORTE | TX |
| 2006-02-01 | 281-581-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LIVERPOOL | TX |
| 2006-01-18 | 281-746-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CYPRESS | TX |
| 2005-12-19 | 281-954-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | APOLLO | 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.