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 561
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-06-24 | 561-657-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WPALMBEACH | FL |
| 2015-12-11 | 561-562-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DELRAY BCH | FL |
| 2015-06-04 | 561-530-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WPALMBEACH | FL |
| 2014-09-16 | 561-419-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BOCA RATON | FL |
| 2014-09-16 | 561-513-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WPALMBEACH | FL |
| 2014-08-12 | 561-501-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DELRAY BCH | FL |
| 2014-07-01 | 561-508-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WPALMBEACH | FL |
| 2014-05-08 | 561-806-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BOYNTONBCH | FL |
| 2014-04-22 | 561-406-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | JUPITER | FL |
| 2014-04-02 | 561-469-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WPALMBEACH | FL |
| 2014-01-10 | 561-507-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WPALMBEACH | FL |
| 2013-10-22 | 561-419-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BOCA RATON | FL |
| 2013-05-29 | 561-410-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WPALMBEACH | FL |
| 2013-01-02 | 561-225-1XXX | 1000–1999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WPALMBEACH | FL |
| 2012-12-31 | 561-270-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DELRAY BCH | FL |
| 2012-01-11 | 561-465-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BOCA RATON | FL |
| 2011-11-16 | 561-855-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WPALMBEACH | FL |
| 2011-09-08 | 561-336-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BOYNTONBCH | FL |
| 2011-05-20 | 561-771-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PAHOKEE | FL |
| 2011-05-03 | 561-328-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WPALMBEACH | FL |
| 2010-10-13 | 561-961-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BOCA RATON | FL |
| 2010-08-17 | 561-727-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WPALMBEACH | FL |
| 2010-03-08 | 561-284-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WPALMBEACH | FL |
| 2009-12-22 | 561-463-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BELLEGLADE | FL |
| 2008-10-13 | 561-372-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BOCA RATON | FL |
| 2008-10-13 | 561-739-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BOYNTONBCH | FL |
| 2008-10-13 | 561-908-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DELRAY BCH | FL |
| 2008-10-13 | 561-972-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | JUPITER | FL |
| 2008-09-18 | 561-247-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WPALMBEACH | FL |
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.