NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 231-758

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

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

The ten 1,000-number thousand-blocks inside prefix 231-758 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 231 blocks

Most active assignees, all time — NPA 231
NEW CINGULAR WIRELESS PCS, LLC - IL 3
ONVOY, LLCV - MI 2
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 2
OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 1
CYNERGYCOMM.NET, INC. - 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
— 231-758-0XXX 0000–0999Reserved OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 PETOSKEY MI
2012-11-07 231-758-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C PETOSKEY MI
2007-08-06 231-758-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PETOSKEY MI
2004-05-27 231-758-3XXX 3000–3999Assigned CYNERGYCOMM.NET, INC. - MI 9245 PETOSKEY MI
2005-03-09 231-758-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PETOSKEY MI
2012-05-04 231-758-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C PETOSKEY MI
2014-10-01 231-758-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PETOSKEY MI
2014-10-01 231-758-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PETOSKEY MI
2013-02-20 231-758-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C PETOSKEY MI
2014-10-01 231-758-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PETOSKEY 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.