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 228
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-07-28 | 228-325-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BILOXI | MS |
| 2016-06-29 | 228-712-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PASCAGOULA | MS |
| 2015-11-19 | 228-327-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | OCEAN SPG | MS |
| 2015-05-19 | 228-314-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | GULFPORT | MS |
| 2014-12-03 | 228-280-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BILOXI | MS |
| 2014-04-04 | 228-357-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | GULFPORT | MS |
| 2011-08-04 | 228-200-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HURLEY | MS |
| 2010-08-02 | 228-344-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BAYSTLOUIS | MS |
| 2010-07-29 | 228-254-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PASSCHRSTN | MS |
| 2010-07-29 | 228-283-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | VANCLEAVE | MS |
| 2010-07-29 | 228-334-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | OCEAN SPG | MS |
| 2010-07-29 | 228-460-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MOSS POINT | MS |
| 2010-07-29 | 228-471-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PASCAGOULA | MS |
| 2010-07-29 | 228-707-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PEARLINGTN | MS |
| 2010-07-29 | 228-731-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | GULFPORT | MS |
| 2010-01-08 | 228-967-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BILOXI | MS |
| 2009-09-03 | 228-641-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | TANNERWLMS | MS |
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.