NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 561-404

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 561-404 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 561 blocks

Most active assignees, all time — NPA 561
LEVEL 3 COMMUNICATIONS, LLC - FL 7
OMNIPOINT MIAMI E LICENSE, LLC 1
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 1
FUSION CLOUD 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
2007-05-10 561-404-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 DELRAY BCH FL
2005-04-19 561-404-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 DELRAY BCH FL
— 561-404-2XXX 2000–2999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 DELRAY BCH FL
2012-04-24 561-404-3XXX 3000–3999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 DELRAY BCH FL
2003-01-23 561-404-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 DELRAY BCH FL
2005-04-19 561-404-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 DELRAY BCH FL
2002-09-16 561-404-6XXX 6000–6999Assigned FUSION CLOUD SERVICES, LLC 206A DELRAY BCH FL
2004-12-02 561-404-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 DELRAY BCH FL
2006-11-27 561-404-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 DELRAY BCH FL
2007-10-16 561-404-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 DELRAY BCH FL

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.