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 |
|---|---|---|---|---|---|---|---|
| 2012-07-20 | 520-394-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | NOGALES | AZ |
| 2012-07-13 | 520-612-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2012-07-13 | 520-612-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2012-07-10 | 520-252-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | CASAGRANDE | AZ |
| 2012-06-27 | 520-353-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | BISBEE | AZ |
| 2012-06-27 | 520-353-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | BISBEE | AZ |
| 2012-06-26 | 520-391-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF ARIZONA, LLC - AZ | 579F | SUPERIOR | AZ |
| 2012-06-20 | 520-353-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 7217 | BISBEE | AZ |
| 2012-06-13 | 520-368-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 7217 | DOUGLAS | AZ |
| 2012-06-13 | 520-457-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 7217 | TOMBSTONE | AZ |
| 2012-06-13 | 520-686-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 7217 | BENSON | AZ |
| 2012-05-29 | 520-332-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2012-05-29 | 520-332-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2012-05-24 | 520-332-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2012-05-24 | 520-510-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CASAGRANDE | AZ |
| 2012-05-24 | 520-612-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2012-05-23 | 520-252-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | CASAGRANDE | AZ |
| 2012-05-18 | 520-200-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | HAYDEN | AZ |
| 2012-05-18 | 520-332-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | TUCSON | AZ |
| 2012-05-18 | 520-332-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | TUCSON | AZ |
| 2012-05-18 | 520-332-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2012-05-16 | 520-353-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | BISBEE | AZ |
| 2012-05-16 | 520-353-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | BISBEE | AZ |
| 2012-05-14 | 520-365-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2012-05-14 | 520-365-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2012-05-10 | 520-277-2XXX | 2000–2999 | Assigned | ONVOY, LLC - AZ | 630E | WHITLOW | AZ |
| 2012-05-10 | 520-338-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2012-05-10 | 520-338-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2012-05-10 | 520-352-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2012-05-10 | 520-353-2XXX | 2000–2999 | Assigned | ONVOY, LLC - AZ | 630E | BISBEE | AZ |
| 2012-05-10 | 520-365-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2012-05-10 | 520-365-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2012-05-10 | 520-365-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2012-05-10 | 520-365-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2012-05-10 | 520-365-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2012-05-10 | 520-789-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - AZ | 587F | TUCSON | AZ |
| 2012-05-03 | 520-200-3XXX | 3000–3999 | Assigned | ONVOY, LLC - AZ | 630E | HAYDEN | AZ |
| 2012-05-03 | 520-201-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | SAN MANUEL | AZ |
| 2012-05-03 | 520-221-2XXX | 2000–2999 | Assigned | ONVOY, LLC - AZ | 630E | BENSON | AZ |
| 2012-05-03 | 520-335-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AZ | 630E | SIERRAVIST | AZ |
| 2012-05-03 | 520-368-0XXX | 0000–0999 | Assigned | ONVOY, LLC - AZ | 630E | DOUGLAS | AZ |
| 2012-05-03 | 520-394-8XXX | 8000–8999 | Assigned | ONVOY, LLC - AZ | 630E | NOGALES | AZ |
| 2012-05-03 | 520-457-0XXX | 0000–0999 | Assigned | ONVOY, LLC - AZ | 630E | TOMBSTONE | AZ |
| 2012-05-02 | 520-337-2XXX | 2000–2999 | Assigned | ONVOY, LLC - AZ | 630E | WILLCOX | AZ |
| 2012-05-02 | 520-391-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | SUPERIOR | AZ |
| 2012-05-02 | 520-464-4XXX | 4000–4999 | Assigned | ONVOY, LLC - AZ | 630E | CASAGRANDE | AZ |
| 2012-05-01 | 520-338-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | TUCSON | AZ |
| 2012-05-01 | 520-338-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | TUCSON | AZ |
| 2012-04-24 | 520-365-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2012-04-24 | 520-365-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | 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.