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 321
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-09-06 | 321-425-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | EAU GALLIE | FL |
| 2016-06-07 | 321-586-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MELBOURNE | FL |
| 2015-07-14 | 321-417-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | COCOA | FL |
| 2014-09-11 | 321-424-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ORLANDO | FL |
| 2014-08-08 | 321-312-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MELBOURNE | FL |
| 2014-02-26 | 321-428-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | EAU GALLIE | FL |
| 2014-01-22 | 321-978-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | COCOA | FL |
| 2013-10-22 | 321-732-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ORLANDO | FL |
| 2013-05-29 | 321-373-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MELBOURNE | FL |
| 2011-08-08 | 321-245-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ORLANDO | FL |
| 2011-07-20 | 321-236-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ORLANDO | FL |
| 2011-01-18 | 321-800-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ORLANDO | FL |
| 2010-04-22 | 321-247-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ORLANDO | FL |
| 2009-12-22 | 321-325-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | GENEVA | FL |
| 2008-10-31 | 321-362-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | TITUSVILLE | FL |
| 2008-10-30 | 321-220-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MELBOURNE | FL |
| 2008-10-30 | 321-286-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WKISSIMMEE | FL |
| 2008-10-30 | 321-338-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | COCOA | FL |
| 2008-10-30 | 321-765-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | OVIEDO | FL |
| 2008-10-30 | 321-775-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | EAU GALLIE | FL |
| 2008-10-30 | 321-785-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | COCOABEACH | FL |
| 2008-10-30 | 321-804-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | EASTORANGE | FL |
| 2008-10-30 | 321-926-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SANFORD | FL |
| 2008-10-30 | 321-972-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WINTERPARK | FL |
| 2008-10-21 | 321-352-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ORLANDO | 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.