NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 407-477

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 407-477 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 407 blocks

Most active assignees, all time — NPA 407
CENTURYLINK OF FLORIDA, INC. (UNITED) 5
LEVEL 3 COMMUNICATIONS, LLC - FL 4
TELEPORT COMMUNICATIONS AMERICA, LLC - FL 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
— 407-477-0XXX 0000–0999Reserved CENTURYLINK OF FLORIDA, INC. (UNITED) 0341 REEDYCREEK FL
— 407-477-1XXX 1000–1999Reserved CENTURYLINK OF FLORIDA, INC. (UNITED) 0341 REEDYCREEK FL
2010-10-06 407-477-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 REEDYCREEK FL
2005-11-09 407-477-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - FL 8300 REEDYCREEK FL
2004-06-01 407-477-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 REEDYCREEK FL
2005-08-26 407-477-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 REEDYCREEK FL
2012-02-10 407-477-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 REEDYCREEK FL
— 407-477-7XXX 7000–7999Reserved CENTURYLINK OF FLORIDA, INC. (UNITED) 0341 REEDYCREEK FL
— 407-477-8XXX 8000–8999Reserved CENTURYLINK OF FLORIDA, INC. (UNITED) 0341 REEDYCREEK FL
— 407-477-9XXX 9000–9999Reserved CENTURYLINK OF FLORIDA, INC. (UNITED) 0341 REEDYCREEK 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.