NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 503-592

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 503-592 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
NEW CINGULAR WIRELESS PCS, LLC 5
TELEPORT COMMUNICATIONS AMERICA, LLC - OR 1
LEVEL 3 TELECOM OF OREGON, LLC - OR 1
ELTOPIA COMMUNICATIONS LLC - OR 1
BANDWIDTH.COM CLEC, 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
2008-10-30 503-592-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - OR 076F CANBYNEEDY OR
— 503-592-1XXX 1000–1999Reserved LEVEL 3 TELECOM OF OREGON, LLC - OR 7537 CANBYNEEDY OR
2017-09-20 503-592-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CANBYNEEDY OR
2018-07-13 503-592-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CANBYNEEDY OR
2022-06-15 503-592-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CANBYNEEDY OR
2021-11-19 503-592-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 CANBYNEEDY OR
2020-04-08 503-592-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CANBYNEEDY OR
2019-06-14 503-592-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CANBYNEEDY OR
2012-03-06 503-592-8XXX 8000–8999Assigned ELTOPIA COMMUNICATIONS LLC - OR 647F CANBYNEEDY OR
2009-06-16 503-592-9XXX 9000–9999Assigned ASTOUND BROADBAND, LLC - OR 936F CANBYNEEDY 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.