NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 352-478

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 352-478 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 352 blocks

Most active assignees, all time — NPA 352
POWERTEL JACKSONVILLE LICENSES, INC. 3
LEVEL 3 COMMUNICATIONS, LLC - FL 2
METROPCS NETWORKS, LLC 1
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 1
COMCAST IP PHONE, 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
2005-12-07 352-478-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 KEYSTN HTS FL
— 352-478-1XXX 1000–1999Reserved POWERTEL JACKSONVILLE LICENSES, INC. 7472 KEYSTN HTS FL
2003-06-05 352-478-2XXX 2000–2999Assigned BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL 9417 KEYSTN HTS FL
2004-10-29 352-478-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 KEYSTN HTS FL
2004-06-01 352-478-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 KEYSTN HTS FL
— 352-478-5XXX 5000–5999Reserved POWERTEL JACKSONVILLE LICENSES, INC. 7472 KEYSTN HTS FL
2005-08-26 352-478-6XXX 6000–6999Assigned POWERTEL JACKSONVILLE LICENSES, INC. 7472 KEYSTN HTS FL
2009-03-02 352-478-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C KEYSTN HTS FL
2007-12-04 352-478-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J KEYSTN HTS FL
— 352-478-9XXX 9000–9999Reserved METROPCS NETWORKS, LLC 899D KEYSTN HTS 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.