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 901
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 |
|---|---|---|---|---|---|---|---|
| 2016-09-27 | 901-671-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2016-09-13 | 901-472-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | COLLIERVL | TN |
| 2016-07-08 | 901-630-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2016-07-08 | 901-630-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2016-05-25 | 901-623-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2015-07-14 | 901-618-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2015-03-11 | 901-567-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2014-12-02 | 901-614-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2014-09-16 | 901-421-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2014-07-08 | 901-567-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2014-03-04 | 901-443-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2013-08-02 | 901-440-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2013-04-25 | 901-505-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2012-08-27 | 901-321-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2012-03-29 | 901-249-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2011-08-03 | 901-405-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2011-04-29 | 901-231-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WESTWHITEV | TN |
| 2011-04-29 | 901-877-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MOSCOW | TN |
| 2011-04-29 | 901-878-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LAGRANGE | TN |
| 2011-03-22 | 901-310-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2011-01-05 | 901-305-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2010-04-22 | 901-308-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
| 2009-10-27 | 901-296-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | COVINGTON | TN |
| 2009-10-27 | 901-687-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ARLINGTON | TN |
| 2009-05-04 | 901-235-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SOMERVILLE | TN |
| 2009-04-24 | 901-286-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | COLLIERVL | TN |
| 2009-04-20 | 901-236-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MEMPHIS | TN |
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.