NumberResearchThousands-blocks in 586-430
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 586-430 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2003-01-02 | 586-430-0XXX | 0000–0999 | Assigned | 123.NET, LLC | 2550 | RICHMOND | MI |
| 2005-02-15 | 586-430-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | RICHMOND | MI |
| 2005-06-25 | 586-430-2XXX | 2000–2999 | Assigned | ACD TELECOM, INC. - MI | 3535 | RICHMOND | MI |
| 2005-11-09 | 586-430-3XXX | 3000–3999 | Assigned | ACD TELECOM, INC. - MI | 3535 | RICHMOND | MI |
| 2011-12-08 | 586-430-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | RICHMOND | MI |
| 2013-03-13 | 586-430-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | RICHMOND | MI |
| 2013-05-21 | 586-430-6XXX | 6000–6999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | RICHMOND | MI |
| 2009-10-21 | 586-430-7XXX | 7000–7999 | Assigned | CLEAR RATE COMMUNICATIONS, LLC | 046L | RICHMOND | MI |
| 2014-03-04 | 586-430-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | RICHMOND | MI |
| — | 586-430-9XXX | 9000–9999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - MI | 770E | RICHMOND | 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.