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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2019-06-28 | 661-863-2XXX | 2000–2999 | Assigned | PACIFIC BELL | 9740 | BKFD MAIN | CA |
| 2019-06-28 | 661-863-3XXX | 3000–3999 | Assigned | PACIFIC BELL | 9740 | BKFD MAIN | CA |
| 2019-06-28 | 661-863-4XXX | 4000–4999 | Assigned | PACIFIC BELL | 9740 | BKFD MAIN | CA |
| 2019-06-28 | 661-863-5XXX | 5000–5999 | Assigned | PACIFIC BELL | 9740 | BKFD MAIN | CA |
| 2016-06-03 | 661-582-7XXX | 7000–7999 | Assigned | PACIFIC BELL (COMPETITIVE) | 7480 | LANCASTER | CA |
| 2015-02-17 | 661-383-4XXX | 4000–4999 | Assigned | PACIFIC BELL | 9740 | SNCA NHCS | CA |
| 2015-02-17 | 661-383-5XXX | 5000–5999 | Assigned | PACIFIC BELL | 9740 | SNCA NHCS | CA |
| 2014-07-30 | 661-483-5XXX | 5000–5999 | Assigned | PACIFIC BELL (COMPETITIVE) | 7480 | LANCASTER | CA |
| 2013-09-19 | 661-473-5XXX | 5000–5999 | Assigned | PACIFIC BELL | 9740 | BKFD SOUTH | CA |
| 2013-09-19 | 661-473-6XXX | 6000–6999 | Assigned | PACIFIC BELL | 9740 | BKFD SOUTH | CA |
| 2013-09-19 | 661-473-8XXX | 8000–8999 | Assigned | PACIFIC BELL | 9740 | BKFD SOUTH | CA |
| 2013-03-20 | 661-471-4XXX | 4000–4999 | Assigned | PACIFIC BELL (COMPETITIVE) | 7480 | LANCASTER | CA |
| 2013-03-12 | 661-471-1XXX | 1000–1999 | Assigned | PACIFIC BELL (COMPETITIVE) | 7480 | LANCASTER | CA |
| 2012-08-24 | 661-529-4XXX | 4000–4999 | Assigned | PACIFIC BELL | 9740 | BKFD SOUTH | CA |
| 2009-01-23 | 661-412-6XXX | 6000–6999 | Assigned | PACIFIC BELL | 9740 | BKFD SOUTH | CA |
| 2008-10-29 | 661-412-5XXX | 5000–5999 | Assigned | PACIFIC BELL | 9740 | BKFD SOUTH | CA |
| 2008-07-23 | 661-524-2XXX | 2000–2999 | Assigned | PACIFIC BELL (COMPETITIVE) | 7480 | LANCASTER | CA |
| 2008-01-03 | 661-200-2XXX | 2000–2999 | Assigned | PACIFIC BELL | 9740 | SNCA NHCS | CA |
| 2007-11-28 | 661-200-1XXX | 1000–1999 | Assigned | PACIFIC BELL | 9740 | SNCA NHCS | CA |
| 2004-09-16 | 661-974-8XXX | 8000–8999 | Assigned | PACIFIC BELL (COMPETITIVE) | 7480 | LANCASTER | CA |
| 2004-08-19 | 661-213-3XXX | 3000–3999 | Assigned | PACIFIC BELL | 9740 | BKFD NORTH | CA |
| 2004-08-19 | 661-213-4XXX | 4000–4999 | Assigned | PACIFIC BELL | 9740 | BKFD NORTH | CA |
| 2004-02-10 | 661-829-2XXX | 2000–2999 | Assigned | PACIFIC BELL | 9740 | BKFD NORTH | CA |
| 2004-02-04 | 661-829-1XXX | 1000–1999 | Assigned | PACIFIC BELL | 9740 | BKFD NORTH | 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.