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 424
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-07-07 | 424-367-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | EL SEGUNDO | CA |
| 2016-05-18 | 424-330-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | SNMN SNMN | CA |
| 2015-03-30 | 424-365-6XXX | 6000–6999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | W ANGELES | CA |
| 2015-01-29 | 424-367-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | EL SEGUNDO | CA |
| 2014-02-25 | 424-320-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | W ANGELES | CA |
| 2014-02-21 | 424-653-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | BEVERLYHLS | CA |
| 2012-12-11 | 424-277-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | EL SEGUNDO | CA |
| 2011-07-28 | 424-278-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | BEVERLYHLS | CA |
| 2007-04-12 | 424-903-7XXX | 7000–7999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | REDONDO | 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.