NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 231-385

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 231-385 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, last 30 days — NPA 231
AHOI LLC 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
2021-08-03 231-385-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CORAL MI
2023-07-13 231-385-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C CORAL MI
2023-03-23 231-385-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C CORAL MI
2022-02-02 231-385-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C CORAL MI
— 231-385-4XXX 4000–4999Available CORAL MI
2021-07-20 231-385-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C CORAL MI
2021-07-20 231-385-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C CORAL MI
2026-08-26 231-385-7XXX 7000–7999Assigned AHOI LLC 883K CORAL MI
— 231-385-8XXX 8000–8999Available CORAL MI
2023-07-20 231-385-9XXX 9000–9999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G CORAL 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.