NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 541-499

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 541-499 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 541 blocks

Most active assignees, all time — NPA 541
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5
METROPCS, INC. 2
CHARTER IP ENABLED SERVICES, LLC 2
NEW CINGULAR WIRELESS PCS, 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
2007-04-04 541-499-0XXX 0000–0999Assigned CHARTER IP ENABLED SERVICES, LLC 792K MEDFORD OR
2007-06-29 541-499-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 MEDFORD OR
2007-06-29 541-499-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 MEDFORD OR
2007-08-23 541-499-3XXX 3000–3999Assigned METROPCS, INC. 5562 MEDFORD OR
2007-08-23 541-499-4XXX 4000–4999Assigned METROPCS, INC. 5562 MEDFORD OR
2007-11-08 541-499-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MEDFORD OR
2007-11-13 541-499-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K MEDFORD OR
2007-10-02 541-499-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 MEDFORD OR
2007-10-02 541-499-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 MEDFORD OR
2007-10-02 541-499-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 MEDFORD OR

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.