NumberResearchRecent thousands-block assignments
5 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, last 30 days — NPA 520
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 |
|---|---|---|---|---|---|---|---|
| 2009-11-12 | 520-350-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CASAGRANDE | AZ |
| 2009-11-12 | 520-350-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CASAGRANDE | AZ |
| 2009-11-11 | 520-344-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2009-11-04 | 520-310-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2009-11-04 | 520-310-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2009-11-04 | 520-310-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2009-11-04 | 520-335-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | SIERRAVIST | AZ |
| 2009-11-04 | 520-709-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | CASAGRANDE | AZ |
| 2009-10-23 | 520-344-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2009-10-23 | 520-344-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2009-10-23 | 520-344-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2009-10-15 | 520-505-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | TUCSON | AZ |
| 2009-10-08 | 520-310-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2009-10-08 | 520-310-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2009-10-08 | 520-334-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2009-09-22 | 520-261-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2009-09-22 | 520-261-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2009-09-22 | 520-261-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2009-09-22 | 520-261-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2009-09-22 | 520-261-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2009-09-22 | 520-261-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2009-09-22 | 520-261-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2009-09-22 | 520-261-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2009-09-22 | 520-261-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2009-09-22 | 520-505-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2009-09-14 | 520-308-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2009-09-14 | 520-310-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2009-09-14 | 520-310-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2009-09-14 | 520-310-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2009-09-14 | 520-310-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2009-09-14 | 520-310-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2009-09-08 | 520-505-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2009-09-03 | 520-505-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2009-09-02 | 520-350-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CASAGRANDE | AZ |
| 2009-09-02 | 520-350-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CASAGRANDE | AZ |
| 2009-09-02 | 520-350-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CASAGRANDE | AZ |
| 2009-09-02 | 520-350-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CASAGRANDE | AZ |
| 2009-08-19 | 520-350-2XXX | 2000–2999 | Assigned | GILA LOCAL EXCHANGE CARRIER, INC. - AZ | 947E | CASAGRANDE | AZ |
| 2009-08-18 | 520-395-8XXX | 8000–8999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2009-08-18 | 520-468-5XXX | 5000–5999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2009-08-18 | 520-505-6XXX | 6000–6999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2009-08-18 | 520-505-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2009-08-18 | 520-505-8XXX | 8000–8999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2009-08-18 | 520-505-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2009-08-11 | 520-576-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2009-08-11 | 520-647-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2009-07-21 | 520-363-6XXX | 6000–6999 | Assigned | ONVOY, LLC - AZ | 630E | HAYDEN | AZ |
| 2009-07-21 | 520-505-3XXX | 3000–3999 | Assigned | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 7175 | TUCSON | AZ |
| 2009-07-17 | 520-261-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2009-07-09 | 520-336-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | 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.