NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 425-405

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 425-405 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 425 blocks

Most active assignees, all time — NPA 425
LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 2
LEVEL 3 COMMUNICATIONS, LLC - WA 2
BANDWIDTH.COM CLEC, LLC - WA 2
NEW CINGULAR WIRELESS PCS, LLC 1
MCIMETRO ACCESS TRANSMISSION SERVICES 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
2009-01-05 425-405-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F EVERETT WA
— 425-405-1XXX 1000–1999Reserved LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 EVERETT WA
2014-08-14 425-405-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 EVERETT WA
2012-11-06 425-405-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J EVERETT WA
2007-07-23 425-405-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 EVERETT WA
2009-01-05 425-405-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F EVERETT WA
2013-01-16 425-405-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 EVERETT WA
2013-10-10 425-405-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 EVERETT WA
2010-09-20 425-405-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EVERETT WA
— 425-405-9XXX 9000–9999Reserved LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 EVERETT WA

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.