NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 541-397

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 541-397 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
ONVOY SPECTRUM, LLC 3
UNITED STATES CELLULAR - OR 2
T-MOBILE USA, INC. 2
TELEPORT COMMUNICATIONS AMERICA, LLC - OR 1
LEVEL 3 COMMUNICATIONS, 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
— 541-397-0XXX 0000–0999Reserved LEVEL 3 COMMUNICATIONS, LLC - OR 3234 THE DALLES OR
— 541-397-1XXX 1000–1999Available THE DALLES OR
2025-02-18 541-397-2XXX 2000–2999Assigned UNITED STATES CELLULAR - OR 6349 THE DALLES OR
2021-09-07 541-397-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H THE DALLES OR
2021-11-12 541-397-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H THE DALLES OR
2021-11-12 541-397-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H THE DALLES OR
2012-12-13 541-397-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 THE DALLES OR
2021-11-17 541-397-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 THE DALLES OR
2021-11-17 541-397-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 THE DALLES OR
2025-02-18 541-397-9XXX 9000–9999Assigned UNITED STATES CELLULAR - OR 6349 THE DALLES 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.