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 909
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-12-07 | 909-688-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FONTANA | CA |
| 2016-08-08 | 909-640-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | RIALTO | CA |
| 2016-05-04 | 909-365-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FONTANA | CA |
| 2015-01-28 | 909-572-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | COLTON | CA |
| 2014-12-05 | 909-672-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HIGHLAND | CA |
| 2014-07-23 | 909-491-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FONTANA | CA |
| 2014-02-21 | 909-990-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | RIALTO | CA |
| 2012-01-26 | 909-346-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FONTANA | CA |
| 2010-07-02 | 909-320-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FONTANA | CA |
| 2006-02-27 | 909-275-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FONTANA | CA |
| 2006-02-06 | 909-533-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | COLTON | CA |
| 2006-02-06 | 909-907-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HIGHLAND | CA |
| 2006-02-06 | 909-961-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | RIALTO | 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.