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 925
New assignments by month
Sep 2026
Aug 2026
Jul 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-06-17 | 925-578-0XXX | 0000–0999 | Assigned | SONIC TELECOM, LLC - CA | 433E | ECONTRCOST | CA |
| 2019-05-15 | 925-306-6XXX | 6000–6999 | Assigned | SONIC TELECOM, LLC - CA | 433E | ECONTRCOST | CA |
| 2017-01-13 | 925-306-0XXX | 0000–0999 | Assigned | SONIC TELECOM, LLC - CA | 433E | ECONTRCOST | CA |
| 2016-08-30 | 925-390-6XXX | 6000–6999 | Assigned | SONIC TELECOM, LLC - CA | 433E | ECONTRCOST | CA |
| 2015-11-18 | 925-317-9XXX | 9000–9999 | Assigned | SONIC TELECOM, LLC - CA | 433E | ORINDA | CA |
| 2015-11-18 | 925-594-4XXX | 4000–4999 | Assigned | SONIC TELECOM, LLC - CA | 433E | DANVILLE | CA |
| 2015-11-18 | 925-794-3XXX | 3000–3999 | Assigned | SONIC TELECOM, LLC - CA | 433E | MORAGA | CA |
| 2015-11-18 | 925-800-4XXX | 4000–4999 | Assigned | SONIC TELECOM, LLC - CA | 433E | LIVERMORE | CA |
| 2015-11-18 | 925-913-3XXX | 3000–3999 | Assigned | SONIC TELECOM, LLC - CA | 433E | BSHP RNCH | CA |
| 2015-11-18 | 925-918-9XXX | 9000–9999 | Assigned | SONIC TELECOM, LLC - CA | 433E | PLEASANTON | CA |
| 2015-11-18 | 925-999-3XXX | 3000–3999 | Assigned | SONIC TELECOM, LLC - CA | 433E | DUBLN-SNRM | CA |
| 2015-03-30 | 925-384-4XXX | 4000–4999 | Assigned | SONIC TELECOM, LLC - CA | 433E | ANTIOCH | CA |
| 2015-03-30 | 925-626-6XXX | 6000–6999 | Assigned | SONIC TELECOM, LLC - CA | 433E | ECONTRCOST | CA |
| 2015-03-30 | 925-635-6XXX | 6000–6999 | Assigned | SONIC TELECOM, LLC - CA | 433E | PITTSBURG | CA |
| 2015-03-30 | 925-889-8XXX | 8000–8999 | Assigned | SONIC TELECOM, LLC - CA | 433E | CLAYTON | CA |
| 2012-12-03 | 925-464-5XXX | 5000–5999 | Assigned | SONIC TELECOM, LLC - CA | 433E | WALNUT CRK | CA |
| 2012-11-28 | 925-385-3XXX | 3000–3999 | Assigned | SONIC TELECOM, LLC - CA | 433E | LAFAYETTE | CA |
| 2012-11-28 | 925-446-8XXX | 8000–8999 | Assigned | SONIC TELECOM, LLC - CA | 433E | CONCORD | CA |
| 2012-11-28 | 925-723-7XXX | 7000–7999 | Assigned | SONIC TELECOM, LLC - CA | 433E | MARTINEZ | 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.