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 304
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2011-08-30 | 304-375-8XXX | 8000–8999 | Assigned | CAS COMMUNICATIONS, LLC - WV | 875F | WILLIAMSTN | WV |
| 2011-05-18 | 304-489-8XXX | 8000–8999 | Assigned | CAS COMMUNICATIONS, LLC - WV | 875F | MINERLWLLS | WV |
| 2011-05-18 | 304-861-7XXX | 7000–7999 | Assigned | CAS COMMUNICATIONS, LLC - WV | 875F | PRKRSBGZN3 | WV |
| 2010-09-22 | 304-273-1XXX | 1000–1999 | Assigned | CAS COMMUNICATIONS, LLC - WV | 875F | RAVENSWOOD | WV |
| 2010-09-22 | 304-786-1XXX | 1000–1999 | Assigned | CAS COMMUNICATIONS, LLC - WV | 875F | RIPLEY | WV |
| 2010-09-22 | 304-893-9XXX | 9000–9999 | Assigned | CAS COMMUNICATIONS, LLC - WV | 875F | PRKRSBGZN1 | WV |
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.