NumberResearchThousands-blocks in 517-235
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 517-235 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 517 blocks
Most active assignees, all time — 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 |
|---|---|---|---|---|---|---|---|
| 2013-02-11 | 517-235-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | DIMONDALE | MI |
| 2013-02-11 | 517-235-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | DIMONDALE | MI |
| 2014-06-16 | 517-235-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | DIMONDALE | MI |
| 2012-02-03 | 517-235-3XXX | 3000–3999 | Assigned | ONVOY, LLCV - MI | 543C | DIMONDALE | MI |
| 2014-06-16 | 517-235-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | DIMONDALE | MI |
| 2013-01-03 | 517-235-5XXX | 5000–5999 | Assigned | ONVOY, LLCV - MI | 543C | DIMONDALE | MI |
| 2012-05-02 | 517-235-6XXX | 6000–6999 | Assigned | WOW! INTERNET, CABLE AND PHONE | 961J | DIMONDALE | MI |
| 2010-12-08 | 517-235-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DIMONDALE | MI |
| 2013-02-11 | 517-235-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | DIMONDALE | MI |
| 2013-02-11 | 517-235-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | DIMONDALE | MI |
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.