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 660
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-08-13 | 660-299-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | EDINA | MO |
| 2024-08-13 | 660-303-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LANCASTER | MO |
| 2024-08-13 | 660-379-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DOWNING | MO |
| 2023-09-05 | 660-677-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ARMSTRONG | MO |
| 2013-12-12 | 660-236-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MARSHALL | MO |
| 2011-09-22 | 660-240-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CHILLICOTH | MO |
| 2011-09-22 | 660-268-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BROOKFIELD | MO |
| 2011-09-22 | 660-322-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CARROLLTON | MO |
| 2011-09-22 | 660-339-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | TRENTON | MO |
| 2011-09-22 | 660-456-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HIGBEE | MO |
| 2011-09-22 | 660-563-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | KNOBNOSTER | MO |
| 2011-09-22 | 660-586-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | NEWFRNKLIN | MO |
| 2011-09-22 | 660-672-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BOONVILLE | MO |
| 2011-09-22 | 660-728-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FAYETTE | MO |
| 2011-09-22 | 660-783-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | STANBERRY | MO |
| 2011-05-20 | 660-338-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | GLASGOW | MO |
| 2011-05-20 | 660-372-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MOBERLY | MO |
| 2011-05-20 | 660-402-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MARCELINE | MO |
| 2011-05-20 | 660-730-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | KIRKSVILLE | MO |
| 2011-05-20 | 660-975-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LA MONTE | MO |
| 2011-03-23 | 660-324-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SLATER | MO |
| 2006-10-17 | 660-553-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SEDALIA | MO |
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.