NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/24/2026
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 909
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 |
|---|---|---|---|---|---|---|---|
| 2015-08-06 | 909-501-0XXX | 0000–0999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | S BERNDINO | CA |
| 2013-06-25 | 909-918-2XXX | 2000–2999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | CALIMESA | CA |
| 2010-03-02 | 909-703-6XXX | 6000–6999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | CHINO | CA |
| 2008-01-28 | 909-252-5XXX | 5000–5999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | S BERNDINO | CA |
| 2007-10-29 | 909-367-7XXX | 7000–7999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | UPLAND | CA |
| 2007-10-29 | 909-809-3XXX | 3000–3999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | REDLANDS | CA |
| 2007-02-22 | 909-436-3XXX | 3000–3999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | ARROWHEAD | CA |
| 2007-02-05 | 909-658-0XXX | 0000–0999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | S BERNDINO | CA |
| 2007-02-05 | 909-658-1XXX | 1000–1999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | S BERNDINO | CA |
| 2007-02-05 | 909-658-2XXX | 2000–2999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | S BERNDINO | CA |
| 2007-02-05 | 909-658-3XXX | 3000–3999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | S BERNDINO | CA |
| 2006-04-27 | 909-652-6XXX | 6000–6999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | UPLAND | CA |
| 2006-04-27 | 909-652-7XXX | 7000–7999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | UPLAND | CA |
| 2006-04-27 | 909-652-8XXX | 8000–8999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | UPLAND | CA |
| 2006-01-25 | 909-922-5XXX | 5000–5999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | ETIWANDA | CA |
| 2005-08-24 | 909-748-8XXX | 8000–8999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | REDLANDS | CA |
| 2005-05-17 | 909-803-5XXX | 5000–5999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | ETIWANDA | CA |
| 2004-12-02 | 909-803-2XXX | 2000–2999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | ETIWANDA | CA |
| 2004-08-23 | 909-646-7XXX | 7000–7999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | ETIWANDA | CA |
| 2004-05-17 | 909-646-8XXX | 8000–8999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | ETIWANDA | CA |
| 2003-09-17 | 909-646-9XXX | 9000–9999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | ETIWANDA | CA |
| 2003-02-24 | 909-463-2XXX | 2000–2999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | ETIWANDA | CA |
| 2002-05-06 | 909-463-7XXX | 7000–7999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | ETIWANDA | CA |
| 2001-10-22 | 909-463-4XXX | 4000–4999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | ETIWANDA | CA |
| 2001-05-18 | 909-463-9XXX | 9000–9999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | ETIWANDA | CA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/24/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.