NumberResearchRecent thousands-block assignments
10 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 517
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2003-04-30 | 517-652-4XXX | 4000–4999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | CHARLOTTE | MI |
| 2003-04-28 | 517-797-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | HILLSDALE | MI |
| 2003-02-27 | 517-376-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | HOWELL | MI |
| 2003-02-26 | 517-992-0XXX | 0000–0999 | Assigned | 123.NET, LLC | 2550 | WILLIAMSTN | MI |
| 2003-02-19 | 517-736-3XXX | 3000–3999 | Assigned | 123.NET, LLC | 2550 | COLDWATER | MI |
| 2003-02-13 | 517-283-8XXX | 8000–8999 | Assigned | 123.NET, LLC | 2550 | READING | MI |
| 2003-02-13 | 517-531-2XXX | 2000–2999 | Assigned | 123.NET, LLC | 2550 | PARMA | MI |
| 2003-02-13 | 517-547-0XXX | 0000–0999 | Assigned | 123.NET, LLC | 2550 | ADDISON | MI |
| 2003-02-13 | 517-568-0XXX | 0000–0999 | Assigned | 123.NET, LLC | 2550 | HOMER | MI |
| 2003-02-12 | 517-392-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | JACKSON | MI |
| 2003-02-12 | 517-448-9XXX | 9000–9999 | Assigned | 123.NET, LLC | 2550 | HUDSON | MI |
| 2003-01-02 | 517-292-8XXX | 8000–8999 | Assigned | 123.NET, LLC | 2550 | HOWELL | MI |
| 2003-01-02 | 517-682-9XXX | 9000–9999 | Assigned | 123.NET, LLC | 2550 | BLISSFIELD | MI |
| 2003-01-02 | 517-815-8XXX | 8000–8999 | Assigned | 123.NET, LLC | 2550 | TECUMSEH | MI |
| 2003-01-02 | 517-902-0XXX | 0000–0999 | Assigned | 123.NET, LLC | 2550 | ADRIAN | MI |
| 2002-12-16 | 517-652-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | CHARLOTTE | MI |
| 2002-12-16 | 517-652-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | CHARLOTTE | MI |
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.