NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 231-715

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 231-715 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
ONVOY, LLCV - MI 2
NEW CINGULAR WIRELESS PCS, LLC - IL 2
TELEPORT COMMUNICATIONS AMERICA, LLC - MI 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
— 231-715-0XXX 0000–0999Reserved NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
2009-02-05 231-715-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E TRAVERSECY MI
2011-02-28 231-715-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C TRAVERSECY MI
2011-08-03 231-715-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 TRAVERSECY MI
2015-06-11 231-715-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E TRAVERSECY MI
2016-02-03 231-715-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C TRAVERSECY MI
— 231-715-6XXX 6000–6999Reserved NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
2012-02-13 231-715-7XXX 7000–7999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L TRAVERSECY MI
2010-05-06 231-715-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 TRAVERSECY MI
2010-08-05 231-715-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY 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.