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 573
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2023-05-05 | 573-862-1XXX | 1000–1999 | Assigned | WINDSTREAM MISSOURI, INC. | 1885 | STELIZABTH | MO |
| 2019-12-05 | 573-255-9XXX | 9000–9999 | Assigned | WINDSTREAM MISSOURI, INC. | 1885 | PONDER | MO |
| 2019-12-05 | 573-297-8XXX | 8000–8999 | Assigned | WINDSTREAM MISSOURI, INC. | 1885 | WAPPAPLLPK | MO |
| 2019-12-05 | 573-354-9XXX | 9000–9999 | Assigned | WINDSTREAM MISSOURI, INC. | 1885 | OXLY | MO |
| 2019-12-05 | 573-593-1XXX | 1000–1999 | Assigned | WINDSTREAM MISSOURI, INC. | 1885 | GRANDIN | MO |
| 2019-12-05 | 573-856-9XXX | 9000–9999 | Assigned | WINDSTREAM MISSOURI, INC. | 1885 | PATTERSON | MO |
| 2016-08-09 | 573-610-9XXX | 9000–9999 | Assigned | WINDSTREAM MISSOURI, INC. | 1885 | IBERIA | MO |
| 2015-06-18 | 573-420-9XXX | 9000–9999 | Assigned | WINDSTREAM MISSOURI, INC. | 1885 | DIXON | MO |
| 2015-06-18 | 573-523-9XXX | 9000–9999 | Assigned | WINDSTREAM MISSOURI, INC. | 1885 | PIEDMONT | MO |
| 2015-06-18 | 573-566-9XXX | 9000–9999 | Assigned | WINDSTREAM MISSOURI, INC. | 1885 | STOVER | MO |
| 2015-06-18 | 573-829-9XXX | 9000–9999 | Assigned | WINDSTREAM MISSOURI, INC. | 1885 | CROCKER | MO |
| 2015-06-18 | 573-868-9XXX | 9000–9999 | Assigned | WINDSTREAM MISSOURI, INC. | 1885 | GREENVILLE | MO |
| 2015-06-18 | 573-939-9XXX | 9000–9999 | Assigned | WINDSTREAM MISSOURI, INC. | 1885 | VANDALIA | MO |
| 2012-05-07 | 573-354-6XXX | 6000–6999 | Assigned | WINDSTREAM MISSOURI, INC. | 1885 | OXLY | MO |
| 2011-11-29 | 573-827-4XXX | 4000–4999 | Assigned | WINDSTREAM MISSOURI, INC. | 1885 | DONIPHAN | 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.