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 442
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-10-08 | 442-422-1XXX | 1000–1999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SHOSHONE | CA |
| 2024-10-08 | 442-899-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WARNER SPG | CA |
| 2024-10-07 | 442-220-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MT PASS | CA |
| 2024-10-07 | 442-239-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DEATH VLY | CA |
| 2017-02-28 | 442-286-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ESCONDIDO | CA |
| 2016-06-24 | 442-254-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FALLBROOK | CA |
| 2016-04-25 | 442-615-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | OCSD OCSD | CA |
| 2016-04-12 | 442-204-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | VISTA | CA |
| 2014-10-09 | 442-248-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ESCONDIDO | CA |
| 2014-07-09 | 442-500-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | OCSD OCSD | CA |
| 2014-05-27 | 442-224-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | VISTA | CA |
| 2013-08-05 | 442-244-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | OCSD CRLS | CA |
| 2011-07-26 | 442-999-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ESCONDIDO | 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.