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 916
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-08-12 | 916-250-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SO PLACER | CA |
| 2015-09-03 | 916-891-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SCRM NORTH | CA |
| 2015-07-10 | 916-823-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SCRM MAIN | CA |
| 2014-12-08 | 916-579-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FAIR OAKS | CA |
| 2014-12-02 | 916-272-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SCRM MAIN | CA |
| 2014-11-21 | 916-621-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SCRM NORTH | CA |
| 2014-07-22 | 916-970-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SCRM MAIN | CA |
| 2014-06-20 | 916-696-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SCRM NORTH | CA |
| 2014-04-08 | 916-936-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FOLSOM | CA |
| 2014-02-11 | 916-917-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SCRM MAIN | CA |
| 2013-09-17 | 916-571-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SCRM NORTH | CA |
| 2013-09-17 | 916-587-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LINCOLN | CA |
| 2013-09-17 | 916-824-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SO PLACER | CA |
| 2013-06-11 | 916-389-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SCRM MAIN | CA |
| 2012-02-06 | 916-382-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SCRM MAIN | CA |
| 2012-02-06 | 916-900-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SCRM NORTH | CA |
| 2011-09-14 | 916-312-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MICHIGNBAR | CA |
| 2011-09-14 | 916-656-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PLEASATGRV | CA |
| 2011-05-17 | 916-243-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | RIO LINDA | CA |
| 2011-03-23 | 916-790-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FOLSOM | CA |
| 2010-09-08 | 916-409-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LINCOLN | CA |
| 2010-04-27 | 916-692-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SCRM NORTH | CA |
| 2010-04-14 | 916-822-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SCRM MAIN | CA |
| 2009-07-10 | 916-692-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SCRM NORTH | CA |
| 2006-08-23 | 916-418-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SCRM NORTH | CA |
| 2006-03-09 | 916-253-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LINCOLN | CA |
| 2006-03-09 | 916-844-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FAIR OAKS | CA |
| 2006-01-26 | 916-467-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FOLSOM | CA |
| 2005-04-25 | 916-251-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SO PLACER | 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.