NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 541-887

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 541-887 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, LLC - OR 2
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 2
T-MOBILE USA, INC. 1
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 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
2008-10-30 541-887-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - OR 076F KLAMATHFLS OR
2021-10-22 541-887-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 KLAMATHFLS OR
2012-08-31 541-887-2XXX 2000–2999Assigned CHARTER IP ENABLED SERVICES, LLC 792K KLAMATHFLS OR
2006-12-01 541-887-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 KLAMATHFLS OR
2016-02-23 541-887-4XXX 4000–4999Assigned ONVOY, LLC - OR 750E KLAMATHFLS OR
2021-10-18 541-887-5XXX 5000–5999Assigned ONVOY, LLC - OR 750E KLAMATHFLS OR
2008-01-31 541-887-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - OR 3234 KLAMATHFLS OR
2012-02-07 541-887-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 KLAMATHFLS OR
2004-10-15 541-887-8XXX 8000–8999Assigned CAL-ORE COMMUNICATIONS, INC. - OR 348D KLAMATHFLS OR
2014-08-13 541-887-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 KLAMATHFLS 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.