NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 810-374

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 810-374 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
ONVOY, LLCV - MI 2
ACD TELECOM, INC. - MI 2
TELEPORT COMMUNICATIONS AMERICA, LLC - MI 1
LEVEL 3 COMMUNICATIONS, LLC - MI 1
CHARTER IP ENABLED SERVICES, 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
2019-02-27 810-374-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C OTISVILLE MI
2005-06-29 810-374-1XXX 1000–1999Assigned ACD TELECOM, INC. - MI 3535 OTISVILLE MI
— 810-374-2XXX 2000–2999Available OTISVILLE MI
2017-04-27 810-374-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C OTISVILLE MI
2006-04-27 810-374-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 OTISVILLE MI
2005-11-09 810-374-5XXX 5000–5999Assigned ACD TELECOM, INC. - MI 3535 OTISVILLE MI
2007-01-17 810-374-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K OTISVILLE MI
2012-06-13 810-374-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E OTISVILLE MI
2014-03-05 810-374-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OTISVILLE MI
— 810-374-9XXX 9000–9999Reserved TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E OTISVILLE 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.