NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 425-496

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 425-496 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
METROPCS, INC. 3
T-MOBILE USA, INC. 2
ONVOY, LLC - WA 2
LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 2
COMCAST IP PHONE, 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
2020-03-16 425-496-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 RENTON WA
— 425-496-1XXX 1000–1999Reserved LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 RENTON WA
— 425-496-2XXX 2000–2999Reserved LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 RENTON WA
2015-12-30 425-496-3XXX 3000–3999Assigned METROPCS, INC. 5562 RENTON WA
2013-05-23 425-496-4XXX 4000–4999Assigned METROPCS, INC. 5562 RENTON WA
2014-09-18 425-496-5XXX 5000–5999Assigned METROPCS, INC. 5562 RENTON WA
2020-11-12 425-496-6XXX 6000–6999Assigned ONVOY, LLC - WA 483E RENTON WA
2011-04-12 425-496-7XXX 7000–7999Assigned ONVOY, LLC - WA 483E RENTON WA
2012-08-03 425-496-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J RENTON WA
2018-10-18 425-496-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 RENTON WA

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.