NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 810-387

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 810-387 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 810 blocks

Most active assignees, all time — NPA 810
FRONTIER NORTH, INC. - MI 5
2
CLEAR RATE COMMUNICATIONS, LLC 1
ACD TELECOM, INC. - MI 1
123.NET, 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
— 810-387-0XXX 0000–0999Reserved FRONTIER NORTH, INC. - MI 0695 YALE MI
— 810-387-1XXX 1000–1999Available YALE MI
— 810-387-2XXX 2000–2999Reserved FRONTIER NORTH, INC. - MI 0695 YALE MI
— 810-387-3XXX 3000–3999Reserved FRONTIER NORTH, INC. - MI 0695 YALE MI
— 810-387-4XXX 4000–4999Reserved FRONTIER NORTH, INC. - MI 0695 YALE MI
2003-01-02 810-387-5XXX 5000–5999Assigned 123.NET, LLC 2550 YALE MI
2005-06-29 810-387-6XXX 6000–6999Assigned ACD TELECOM, INC. - MI 3535 YALE MI
2010-05-19 810-387-7XXX 7000–7999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L YALE MI
— 810-387-8XXX 8000–8999Available YALE MI
— 810-387-9XXX 9000–9999Reserved FRONTIER NORTH, INC. - MI 0695 YALE 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.