NumberResearchRecent thousands-block assignments
0 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, all time — 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 | 520-706-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-706-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-706-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-706-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-706-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-706-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-706-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-706-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-706-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-706-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-707-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-707-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-707-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-707-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-707-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-707-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-707-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-707-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-707-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-707-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-708-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-708-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-708-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-708-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-708-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-708-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-708-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-708-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-708-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-708-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-713-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-713-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-713-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-713-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-713-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-713-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-713-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-713-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-713-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-713-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-714-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-714-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-714-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-714-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-714-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-714-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-714-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-714-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-714-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-714-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | 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.