NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 727-431

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 727-431 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 727 blocks

Most active assignees, all time — NPA 727
MCI WORLDCOM COMMUNICATIONS, INC. - FL 8
LEVEL 3 COMMUNICATIONS, LLC - FL 1
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - 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
— 727-431-0XXX 0000–0999Reserved MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
— 727-431-1XXX 1000–1999Reserved MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
2007-04-10 727-431-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 CLEARWATER FL
— 727-431-3XXX 3000–3999Reserved MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
— 727-431-4XXX 4000–4999Reserved MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
— 727-431-5XXX 5000–5999Reserved MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
— 727-431-6XXX 6000–6999Reserved MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
— 727-431-7XXX 7000–7999Reserved MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
— 727-431-8XXX 8000–8999Reserved MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
2010-12-22 727-431-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 CLEARWATER 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.