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 925
New assignments by month
Sep 2026
Aug 2026
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Jun 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-10-27 | 925-390-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ECONTRCOST | CA |
| 2016-06-20 | 925-267-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PITTSBURG | CA |
| 2015-04-21 | 925-667-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LIVERMORE | CA |
| 2014-12-05 | 925-384-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ANTIOCH | CA |
| 2014-05-23 | 925-448-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WALNUT CRK | CA |
| 2014-02-07 | 925-626-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ECONTRCOST | CA |
| 2013-07-17 | 925-446-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CONCORD | CA |
| 2013-01-23 | 925-791-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DANVILLE | CA |
| 2012-02-15 | 925-732-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ANTIOCH | CA |
| 2012-01-18 | 925-568-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SUNOL | CA |
| 2010-04-23 | 925-560-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DUBLN-SNRM | CA |
| 2010-04-20 | 925-679-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ECONTRCOST | CA |
| 2008-07-30 | 925-385-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LAFAYETTE | CA |
| 2006-10-19 | 925-387-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MARTINEZ | CA |
| 2006-10-19 | 925-583-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LIVERMORE | CA |
| 2006-10-19 | 925-643-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PSBG WEST | CA |
| 2006-06-21 | 925-257-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ORINDA | CA |
| 2006-06-13 | 925-978-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ANTIOCH | CA |
| 2006-06-09 | 925-425-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PLEASANTON | CA |
| 2006-06-09 | 925-822-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CONCORD | CA |
| 2006-06-08 | 925-415-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BSHP RNCH | CA |
| 2006-05-16 | 925-476-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WALNUT CRK | CA |
| 2006-04-11 | 925-267-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PITTSBURG | CA |
| 2006-04-11 | 925-304-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CLAYTON | CA |
| 2006-03-10 | 925-230-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DUBLN-SNRM | CA |
| 2006-03-10 | 925-392-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ECONTRCOST | CA |
| 2005-08-31 | 925-794-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MORAGA | CA |
| 2005-04-25 | 925-718-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DANVILLE | 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.