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 520
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-03-01 | 520-652-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | WHITLOW | AZ |
| 2020-10-22 | 520-472-6XXX | 6000–6999 | Assigned | QWEST CORPORATION | 9636 | CASAGRANDE | AZ |
| 2019-08-27 | 520-472-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | CASAGRANDE | AZ |
| 2019-08-27 | 520-472-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | CASAGRANDE | AZ |
| 2018-11-02 | 520-759-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | CASAGRANDE | AZ |
| 2018-11-02 | 520-759-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | CASAGRANDE | AZ |
| 2018-06-15 | 520-340-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | CASAGRANDE | AZ |
| 2016-05-05 | 520-217-4XXX | 4000–4999 | Assigned | QWEST CORPORATION | 9636 | CASAGRANDE | AZ |
| 2016-05-05 | 520-217-5XXX | 5000–5999 | Assigned | QWEST CORPORATION | 9636 | CASAGRANDE | AZ |
| 2015-12-30 | 520-217-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | CASAGRANDE | AZ |
| 2014-05-15 | 520-328-0XXX | 0000–0999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2014-05-15 | 520-328-1XXX | 1000–1999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2014-05-15 | 520-328-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2014-05-15 | 520-328-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2014-04-30 | 520-775-4XXX | 4000–4999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2014-04-30 | 520-775-5XXX | 5000–5999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2014-04-30 | 520-775-6XXX | 6000–6999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2014-04-30 | 520-775-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2014-04-30 | 520-775-8XXX | 8000–8999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2014-04-30 | 520-775-9XXX | 9000–9999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2011-10-10 | 520-222-0XXX | 0000–0999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2011-10-10 | 520-222-1XXX | 1000–1999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2011-09-28 | 520-724-9XXX | 9000–9999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2011-02-04 | 520-724-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2011-02-04 | 520-724-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2011-02-04 | 520-724-4XXX | 4000–4999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2011-02-04 | 520-724-5XXX | 5000–5999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2011-02-04 | 520-724-6XXX | 6000–6999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2011-02-04 | 520-724-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2011-02-04 | 520-724-8XXX | 8000–8999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2009-02-17 | 520-454-0XXX | 0000–0999 | Assigned | QWEST CORPORATION | 9636 | SIERRAVIST | AZ |
| 2009-02-17 | 520-454-1XXX | 1000–1999 | Assigned | QWEST CORPORATION | 9636 | SIERRAVIST | AZ |
| 2009-02-17 | 520-454-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | SIERRAVIST | AZ |
| 2009-02-17 | 520-454-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | SIERRAVIST | AZ |
| 2009-02-17 | 520-454-4XXX | 4000–4999 | Assigned | QWEST CORPORATION | 9636 | SIERRAVIST | AZ |
| 2009-02-17 | 520-454-5XXX | 5000–5999 | Assigned | QWEST CORPORATION | 9636 | SIERRAVIST | AZ |
| 2009-02-17 | 520-454-6XXX | 6000–6999 | Assigned | QWEST CORPORATION | 9636 | SIERRAVIST | AZ |
| 2009-02-17 | 520-454-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | SIERRAVIST | AZ |
| 2009-02-17 | 520-454-8XXX | 8000–8999 | Assigned | QWEST CORPORATION | 9636 | SIERRAVIST | AZ |
| 2009-02-17 | 520-454-9XXX | 9000–9999 | Assigned | QWEST CORPORATION | 9636 | SIERRAVIST | AZ |
| 2009-02-03 | 520-334-6XXX | 6000–6999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2008-05-02 | 520-638-0XXX | 0000–0999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2008-05-02 | 520-638-1XXX | 1000–1999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2008-05-02 | 520-638-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2008-05-02 | 520-638-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2008-05-02 | 520-638-4XXX | 4000–4999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2008-01-18 | 520-988-6XXX | 6000–6999 | Assigned | QWEST CORPORATION | 9636 | NOGALES | AZ |
| 2007-11-08 | 520-858-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | CASAGRANDE | AZ |
| 2007-11-08 | 520-858-8XXX | 8000–8999 | Assigned | QWEST CORPORATION | 9636 | CASAGRANDE | AZ |
| 2007-08-27 | 520-582-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | CASAGRANDE | AZ |
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.