NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 541-303

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The ten 1,000-number thousand-blocks inside prefix 541-303 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
LEVEL 3 COMMUNICATIONS, LLC - OR 2
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 2
UNITED STATES CELLULAR - OR 1
TELEPORT COMMUNICATIONS AMERICA, LLC - OR 1
PEERLESS NETWORK OF OREGON, LLC - OR 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
— 541-303-0XXX 0000–0999Reserved LEVEL 3 COMMUNICATIONS, LLC - OR 3234 HERMISTON OR
2013-10-28 541-303-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K HERMISTON OR
2012-08-01 541-303-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - OR 3234 HERMISTON OR
2012-05-25 541-303-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 HERMISTON OR
2018-03-14 541-303-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 HERMISTON OR
2014-02-12 541-303-5XXX 5000–5999Assigned UNITED STATES CELLULAR - OR 6349 HERMISTON OR
2012-12-13 541-303-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 HERMISTON OR
2014-01-22 541-303-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HERMISTON OR
2013-11-19 541-303-8XXX 8000–8999Assigned PEERLESS NETWORK OF OREGON, LLC - OR 157F HERMISTON OR
2012-09-07 541-303-9XXX 9000–9999Assigned ONVOY, LLC - OR 750E HERMISTON OR

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.