NumberResearchRecent thousands-block assignments
47 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/18/2026
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
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 | Block | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 2024-01-08 | 520-717-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-717-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-717-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-717-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-717-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-717-8XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-717-9XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-0XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-1XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-8XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-718-9XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-0XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-1XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-8XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2024-01-08 | 520-725-9XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-12-15 | 765-835-9XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RICHMOND | IN |
| 2023-10-31 | 234-837-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | TWINSBURG | OH |
| 2023-10-31 | 904-882-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | JACKSONVL | FL |
| 2023-10-30 | 442-542-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NEEDLES | CA |
| 2023-10-25 | 227-219-1XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ASHTON236 | MD |
| 2023-10-25 | 227-219-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ASHTON236 | MD |
| 2023-10-25 | 227-219-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ASHTON236 | MD |
| 2023-10-25 | 227-219-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ASHTON236 | MD |
| 2023-10-20 | 662-810-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | VERONA | MS |
| 2023-10-17 | 603-805-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | CONCORD | NH |
| 2023-10-17 | 838-280-9XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ALBANY | NY |
| 2023-08-31 | 520-684-0XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-08-31 | 520-684-1XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-08-31 | 520-684-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-08-31 | 520-684-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-08-31 | 520-684-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-08-31 | 520-684-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-08-31 | 520-684-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-08-31 | 520-684-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-08-31 | 520-684-8XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-08-31 | 520-684-9XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-08-31 | 520-687-0XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-08-31 | 520-687-1XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/18/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.