NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/26/2026
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 817
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-02-26 | 817-662-8XXX | 8000–8999 | Assigned | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 0701 | EULESS | TX |
| 2021-06-21 | 817-541-2XXX | 2000–2999 | Assigned | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 0701 | ROANOKE | TX |
| 2013-12-11 | 817-345-8XXX | 8000–8999 | Assigned | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 0701 | NRICHLDHLS | TX |
| 2011-01-31 | 817-369-4XXX | 4000–4999 | Assigned | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 0701 | NRICHLDHLS | TX |
| 2009-01-13 | 817-567-1XXX | 1000–1999 | Assigned | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 0701 | ROANOKE | TX |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.