NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 586-218

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

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The ten 1,000-number thousand-blocks inside prefix 586-218 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
WOW! INTERNET, CABLE AND PHONE 2
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 2
TELNET WORLDWIDE, INC. 1
OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 1
LEVEL 3 COMMUNICATIONS, LLC - MI 1
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2007-09-04 586-218-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ROSEVILLE MI
2008-06-12 586-218-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K ROSEVILLE MI
2005-06-25 586-218-2XXX 2000–2999Assigned ACD TELECOM, INC. - MI 3535 ROSEVILLE MI
2004-11-10 586-218-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROSEVILLE MI
2004-06-15 586-218-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ROSEVILLE MI
2005-08-03 586-218-5XXX 5000–5999Assigned TELNET WORLDWIDE, INC. 817J ROSEVILLE MI
2005-08-05 586-218-6XXX 6000–6999Assigned 123.NET, LLC 2550 ROSEVILLE MI
2005-08-05 586-218-7XXX 7000–7999Assigned WOW! INTERNET, CABLE AND PHONE 961J ROSEVILLE MI
2005-08-05 586-218-8XXX 8000–8999Assigned WOW! INTERNET, CABLE AND PHONE 961J ROSEVILLE MI
2007-10-23 586-218-9XXX 9000–9999Assigned 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.