Thousands-blocks in 734-666

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 734-666 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 734 blocks

Most active assignees, all time — NPA 734

BANDWIDTH.COM CLEC, LLC - MI 3

LEVEL 3 COMMUNICATIONS, LLC - MI 2

TELEPORT COMMUNICATIONS AMERICA, LLC - MI 1

PAETEC ITEL, LLC 1

ONVOY, LLCV - 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

Recent thousands-block assignments
Assigned	Thousands-block	Last 4 digits	Status	Assignee	OCN	Rate center	State
2008-01-17	734-666-0XXX	0000–0999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - MI	6120	LIVONIA	MI
2009-10-05	734-666-1XXX	1000–1999	Assigned	PAETEC ITEL, LLC	829J	LIVONIA	MI
2016-04-11	734-666-2XXX	2000–2999	Assigned	BANDWIDTH.COM CLEC, LLC - MI	991E	LIVONIA	MI
2011-08-31	734-666-3XXX	3000–3999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - MI	6120	LIVONIA	MI
2016-06-20	734-666-4XXX	4000–4999	Assigned	TELEPORT COMMUNICATIONS AMERICA, LLC - MI	770E	LIVONIA	MI
2011-05-31	734-666-5XXX	5000–5999	Assigned	BANDWIDTH.COM CLEC, LLC - MI	991E	LIVONIA	MI
2011-05-31	734-666-6XXX	6000–6999	Assigned	BANDWIDTH.COM CLEC, LLC - MI	991E	LIVONIA	MI
—	734-666-7XXX	7000–7999	Reserved	MICHIGAN BELL TEL CO	9323	LIVONIA	MI
2014-07-23	734-666-8XXX	8000–8999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	LIVONIA	MI
2014-08-05	734-666-9XXX	9000–9999	Assigned	ONVOY, LLCV - MI	543C	LIVONIA	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.