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 540
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2020-02-18 | 540-575-2XXX | 2000–2999 | Assigned | CSC WIRELESS, LLC | 425J | HARRISONBG | VA |
| 2019-10-09 | 540-706-2XXX | 2000–2999 | Assigned | CSC WIRELESS, LLC | 425J | FREDECKSBG | VA |
| 2019-06-24 | 540-475-0XXX | 0000–0999 | Assigned | CSC WIRELESS, LLC | 425J | NARROWS | VA |
| 2019-05-07 | 540-787-8XXX | 8000–8999 | Assigned | CSC WIRELESS, LLC | 425J | PEARISBURG | VA |
| 2019-05-07 | 540-787-9XXX | 9000–9999 | Assigned | CSC WIRELESS, LLC | 425J | PEARISBURG | VA |
| 2019-03-18 | 540-475-2XXX | 2000–2999 | Assigned | CSC WIRELESS, LLC | 425J | NARROWS | VA |
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.