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 623
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2019-08-27 | 623-471-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2019-08-27 | 623-471-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2019-02-15 | 623-248-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2017-04-10 | 623-230-5XXX | 5000–5999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2017-04-10 | 623-230-6XXX | 6000–6999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2016-11-22 | 623-232-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2016-10-20 | 623-232-4XXX | 4000–4999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2016-06-28 | 623-235-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2016-05-10 | 623-235-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2015-05-26 | 623-285-0XXX | 0000–0999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2015-05-26 | 623-285-1XXX | 1000–1999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2015-05-26 | 623-285-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2015-02-27 | 623-633-8XXX | 8000–8999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2012-09-19 | 623-888-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-524-0XXX | 0000–0999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-524-1XXX | 1000–1999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-524-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-524-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-524-4XXX | 4000–4999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-524-5XXX | 5000–5999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-524-6XXX | 6000–6999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-524-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-524-8XXX | 8000–8999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-524-9XXX | 9000–9999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-832-0XXX | 0000–0999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-832-1XXX | 1000–1999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-832-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-832-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-832-4XXX | 4000–4999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-832-5XXX | 5000–5999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-832-6XXX | 6000–6999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-832-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-832-8XXX | 8000–8999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-07-08 | 623-832-9XXX | 9000–9999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2010-02-02 | 623-806-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2008-07-16 | 623-207-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2008-06-23 | 623-207-0XXX | 0000–0999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2008-06-06 | 623-207-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2008-01-03 | 623-234-5XXX | 5000–5999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2008-01-03 | 623-234-6XXX | 6000–6999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2008-01-03 | 623-234-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2007-07-27 | 623-237-4XXX | 4000–4999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2007-07-27 | 623-237-5XXX | 5000–5999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2007-07-27 | 623-237-6XXX | 6000–6999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2007-07-27 | 623-237-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2007-06-11 | 623-236-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2007-04-24 | 623-241-8XXX | 8000–8999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2007-03-30 | 623-222-0XXX | 0000–0999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2007-03-30 | 623-222-1XXX | 1000–1999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2007-03-30 | 623-222-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
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.