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 310
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2014-02-05 | 310-725-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | HAWTHORNE | CA |
| 2000-03-14 | 310-404-0XXX | 0000–0999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | CMTN GRDN | CA |
| 2000-03-14 | 310-427-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | SAN PEDRO | CA |
| 2000-03-14 | 310-531-1XXX | 1000–1999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | HAWTHORNE | CA |
| 2000-03-14 | 310-602-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LOMITA | CA |
| 2000-03-14 | 310-774-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | MALIBU | CA |
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.