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 661
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-04-29 | 661-573-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BKFD MAIN | CA |
| 2015-08-04 | 661-535-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BKFD NORTH | CA |
| 2015-06-16 | 661-234-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PLDL PLDL | CA |
| 2015-02-25 | 661-491-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BKFD SOUTH | CA |
| 2014-12-11 | 661-495-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNCA NHCS | CA |
| 2014-08-28 | 661-493-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BKFD MAIN | CA |
| 2014-07-01 | 661-430-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNCA SGCC | CA |
| 2014-04-28 | 661-556-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BKFD SOUTH | CA |
| 2014-02-07 | 661-410-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BKFD NORTH | CA |
| 2013-11-07 | 661-441-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PLDL PLDL | CA |
| 2012-01-26 | 661-800-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BKFD MAIN | CA |
| 2011-08-19 | 661-282-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BKFD SOUTH | CA |
| 2011-08-19 | 661-678-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNCA NHCS | CA |
| 2011-07-26 | 661-276-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | EDWARDS | CA |
| 2011-06-01 | 661-878-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PLDL PLDL | CA |
| 2011-05-26 | 661-232-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MOJAVE | CA |
| 2011-05-26 | 661-279-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ROSAMOND | CA |
| 2011-05-26 | 661-289-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LEBEC | CA |
| 2011-05-26 | 661-292-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SHAFTER | CA |
| 2011-05-26 | 661-438-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WASCO | CA |
| 2011-05-26 | 661-532-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BIG BUTTE | CA |
| 2011-05-26 | 661-552-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | EARLIMART | CA |
| 2011-05-26 | 661-622-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PLDL LNVY | CA |
| 2011-05-26 | 661-825-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | TEHACHAPI | CA |
| 2011-05-06 | 661-673-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNCA SGCC | CA |
| 2011-03-09 | 661-773-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WALKERBSIN | CA |
| 2011-02-15 | 661-615-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BKFD NORTH | CA |
| 2010-11-17 | 661-474-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DELANO | CA |
| 2010-07-08 | 661-670-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNCA NHCS | CA |
| 2010-05-17 | 661-412-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BKFD SOUTH | CA |
| 2010-03-15 | 661-977-1XXX | 1000–1999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNCA SGCC | CA |
| 2009-12-14 | 661-436-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ARVIN | CA |
| 2008-05-07 | 661-368-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BKFD NORTH | CA |
| 2008-04-03 | 661-412-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BKFD SOUTH | CA |
| 2006-10-24 | 661-526-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PLDL PLDL | CA |
| 2006-10-19 | 661-268-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PLDL AGDL | CA |
| 2006-02-06 | 661-367-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNCA SGCC | CA |
| 2006-02-06 | 661-753-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNCA NHCS | CA |
| 2005-04-08 | 661-742-1XXX | 1000–1999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BKFD MAIN | 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.