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 |
|---|---|---|---|---|---|---|---|
| 2015-07-15 | 520-729-2XXX | 2000–2999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-07-15 | 520-729-4XXX | 4000–4999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-07-09 | 520-263-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | SIERRAVIST | AZ |
| 2015-06-30 | 520-595-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | BENSON | AZ |
| 2015-06-24 | 520-200-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | HAYDEN | AZ |
| 2015-06-24 | 520-348-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | WILLCOX | AZ |
| 2015-06-23 | 520-348-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | WILLCOX | AZ |
| 2015-06-23 | 520-729-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | TUCSON | AZ |
| 2015-06-23 | 520-729-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | TUCSON | AZ |
| 2015-06-22 | 520-470-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | NOGALES | AZ |
| 2015-06-15 | 520-595-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF ARIZONA, LLC - AZ | 579F | BENSON | AZ |
| 2015-06-09 | 520-263-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF ARIZONA, LLC - AZ | 579F | SIERRAVIST | AZ |
| 2015-06-08 | 520-595-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BENSON | AZ |
| 2015-05-29 | 520-639-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-05-27 | 520-639-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2015-05-26 | 520-200-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HAYDEN | AZ |
| 2015-05-26 | 520-415-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | NOGALES | AZ |
| 2015-05-26 | 520-896-8XXX | 8000–8999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | SAN MANUEL | AZ |
| 2015-05-19 | 520-450-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | CASAGRANDE | AZ |
| 2015-05-18 | 520-485-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2015-05-18 | 520-485-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2015-05-18 | 520-485-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2015-05-18 | 520-485-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2015-05-18 | 520-485-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2015-05-18 | 520-485-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2015-05-18 | 520-485-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2015-05-18 | 520-485-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2015-05-18 | 520-485-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2015-05-18 | 520-485-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2015-05-08 | 520-635-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CASAGRANDE | AZ |
| 2015-04-20 | 520-639-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | TUCSON | AZ |
| 2015-04-14 | 520-200-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF ARIZONA, LLC - AZ | 579F | HAYDEN | AZ |
| 2015-04-10 | 520-635-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | CASAGRANDE | AZ |
| 2015-04-10 | 520-635-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | CASAGRANDE | AZ |
| 2015-04-10 | 520-635-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | CASAGRANDE | AZ |
| 2015-04-10 | 520-689-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | SUPERIOR | AZ |
| 2015-04-09 | 520-251-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AZ | 630E | CASAGRANDE | AZ |
| 2015-04-02 | 520-381-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | CASAGRANDE | AZ |
| 2015-04-02 | 520-500-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2015-04-02 | 520-500-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2015-04-02 | 520-500-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2015-04-02 | 520-815-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2015-04-02 | 520-815-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2015-03-27 | 520-500-8XXX | 8000–8999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-03-27 | 520-500-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-03-11 | 520-815-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2015-03-11 | 520-815-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2015-03-11 | 520-815-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2015-03-11 | 520-815-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2015-03-11 | 520-815-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | 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.