NumberResearchRecent thousands-block assignments
5 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, 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 |
|---|---|---|---|---|---|---|---|
| 2024-01-08 | 520-716-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-716-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-716-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-716-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-716-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-716-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-716-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-717-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-717-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-717-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-717-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-717-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-717-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-717-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-717-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-717-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-717-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-05 | 520-266-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SIERRAVIST | AZ |
| 2024-01-05 | 520-567-8XXX | 8000–8999 | Assigned | TERRA NOVA TELECOM INC. | 145J | HAYDEN | AZ |
| 2024-01-05 | 520-569-7XXX | 7000–7999 | Assigned | TERRA NOVA TELECOM INC. | 145J | SAN MANUEL | AZ |
| 2024-01-05 | 520-583-9XXX | 9000–9999 | Assigned | TERRA NOVA TELECOM INC. | 145J | WHITLOW | AZ |
| 2024-01-05 | 520-681-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | NOGALES | AZ |
| 2024-01-05 | 520-701-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | CASAGRANDE | AZ |
| 2024-01-05 | 520-701-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | CASAGRANDE | AZ |
| 2024-01-05 | 520-701-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | CASAGRANDE | AZ |
| 2024-01-05 | 520-701-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | CASAGRANDE | AZ |
| 2023-12-15 | 520-701-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CASAGRANDE | AZ |
| 2023-12-15 | 520-701-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CASAGRANDE | AZ |
| 2023-12-08 | 520-703-1XXX | 1000–1999 | Assigned | CALLWORKS CORPORATION | 475J | TUCSON | AZ |
| 2023-12-07 | 520-602-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | 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.