NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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 408
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2012-02-06 | 408-784-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNJS SOUTH | CA |
| 2011-05-04 | 408-837-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SAN MARTIN | CA |
| 2011-02-25 | 408-791-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNJS NORTH | CA |
| 2010-05-13 | 408-320-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNJS WEST | CA |
| 2010-04-07 | 408-622-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNJS SOUTH | CA |
| 2010-03-24 | 408-320-1XXX | 1000–1999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNJS WEST | CA |
| 2006-07-07 | 408-628-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CAMPBELL | CA |
| 2006-06-13 | 408-352-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNJS WEST | CA |
| 2006-06-13 | 408-685-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SUNNYVALE | CA |
| 2006-06-09 | 408-649-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNJS NORTH | CA |
| 2006-03-10 | 408-740-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SARATOGA | CA |
| 2005-08-25 | 408-728-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNJS SOUTH | CA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.