NumberResearchThousands-blocks in 586-859
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 586-859 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
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2011-05-17 | 586-859-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - MI | 991E | ROSEVILLE | MI |
| 2007-11-12 | 586-859-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROSEVILLE | MI |
| — | 586-859-2XXX | 2000–2999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - MI | 770E | ROSEVILLE | MI |
| 2011-06-03 | 586-859-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROSEVILLE | MI |
| — | 586-859-4XXX | 4000–4999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - MI | 770E | ROSEVILLE | MI |
| 2012-02-07 | 586-859-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ROSEVILLE | MI |
| — | 586-859-6XXX | 6000–6999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - MI | 770E | ROSEVILLE | MI |
| 2006-03-09 | 586-859-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ROSEVILLE | MI |
| 2007-07-03 | 586-859-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROSEVILLE | MI |
| 2007-07-03 | 586-859-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROSEVILLE | 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.