NumberResearchThousands-blocks in 586-477
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026
The ten 1,000-number thousand-blocks inside prefix 586-477 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 586 blocks
Most active assignees, all time — NPA 586
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2007-11-02 | 586-477-0XXX | 0000–0999 | Assigned | WOW! INTERNET, CABLE AND PHONE | 961J | MT CLEMENS | MI |
| 2007-07-06 | 586-477-1XXX | 1000–1999 | Assigned | WOW! INTERNET, CABLE AND PHONE | 961J | MT CLEMENS | MI |
| 2004-12-17 | 586-477-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | MT CLEMENS | MI |
| 2005-01-05 | 586-477-3XXX | 3000–3999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | MT CLEMENS | MI |
| — | 586-477-4XXX | 4000–4999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | MT CLEMENS | MI |
| 2004-07-15 | 586-477-5XXX | 5000–5999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | MT CLEMENS | MI |
| 2013-08-09 | 586-477-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | MT CLEMENS | MI |
| 2004-11-15 | 586-477-7XXX | 7000–7999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | MT CLEMENS | MI |
| 2004-12-09 | 586-477-8XXX | 8000–8999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | MT CLEMENS | MI |
| 2005-11-22 | 586-477-9XXX | 9000–9999 | Assigned | PAETEC ITEL, LLC | 829J | MT CLEMENS | 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.