NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 503-354

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 503-354 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 503 blocks

Most active assignees, all time — NPA 503
T-MOBILE USA, INC. 2
CHARTER IP ENABLED SERVICES, LLC 2
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 2
LEVEL 3 COMMUNICATIONS, LLC - OR 1
HUNTER CONSTRUCTION, INC. DBA HUNTER COMMS - 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
2008-10-30 503-354-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - OR 076F TILLAMOOK OR
2013-07-23 503-354-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - OR 3234 TILLAMOOK OR
2008-04-16 503-354-2XXX 2000–2999Assigned CHARTER IP ENABLED SERVICES, LLC 792K TILLAMOOK OR
2017-01-04 503-354-3XXX 3000–3999Assigned ASTOUND BROADBAND, LLC - OR 936F TILLAMOOK OR
2010-02-12 503-354-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 TILLAMOOK OR
2013-10-15 503-354-5XXX 5000–5999Assigned CHARTER IP ENABLED SERVICES, LLC 792K TILLAMOOK OR
2018-07-13 503-354-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TILLAMOOK OR
2015-04-10 503-354-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 TILLAMOOK OR
2015-05-11 503-354-8XXX 8000–8999Assigned HUNTER CONSTRUCTION, INC. DBA HUNTER COMMS - OR 660C TILLAMOOK OR
2018-07-13 503-354-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TILLAMOOK 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.