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 650
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2017-04-14 | 650-447-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MT VIEW | CA |
| 2016-05-11 | 650-260-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | REDWOOD CY | CA |
| 2014-06-04 | 650-656-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PALO ALTO | CA |
| 2014-04-04 | 650-634-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SSNFRNCSCO | CA |
| 2013-04-08 | 650-235-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SAN MATEO | CA |
| 2011-07-28 | 650-263-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MOSS BEACH | CA |
| 2011-07-28 | 650-297-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PESCADERO | CA |
| 2009-12-14 | 650-673-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LA HONDA | CA |
| 2008-10-01 | 650-683-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WOODSIDE | CA |
| 2008-07-30 | 650-729-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HALFMOONBY | CA |
| 2007-08-09 | 650-935-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LOS ALTOS | CA |
| 2006-10-19 | 650-362-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | REDWOOD CY | CA |
| 2006-06-09 | 650-384-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PALO ALTO | CA |
| 2006-05-16 | 650-315-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SAN MATEO | CA |
| 2006-05-16 | 650-636-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SSNFRNCSCO | CA |
| 2006-03-10 | 650-231-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MILLBRAE | CA |
| 2006-03-10 | 650-264-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNCRL-BLMT | CA |
| 2006-03-10 | 650-282-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MT VIEW | CA |
| 2006-03-10 | 650-290-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PACIFICA | 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.