NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 231-202

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 231-202 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 5
ONVOY, LLCV - MI 3
ONVOY SPECTRUM, LLC 1
BANDWIDTH.COM CLEC, 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
2018-09-20 231-202-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C MECOSTA MI
— 231-202-1XXX 1000–1999Reserved NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MECOSTA MI
2019-11-19 231-202-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MECOSTA MI
2019-11-19 231-202-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C MECOSTA MI
2019-11-19 231-202-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C MECOSTA MI
2021-05-24 231-202-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H MECOSTA MI
— 231-202-6XXX 6000–6999Reserved NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MECOSTA MI
— 231-202-7XXX 7000–7999Reserved NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MECOSTA MI
— 231-202-8XXX 8000–8999Reserved NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MECOSTA MI
— 231-202-9XXX 9000–9999Reserved NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MECOSTA 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.