NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 501-333

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 501-333 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 501 blocks

Most active assignees, all time — NPA 501
WINDSTREAM ARKANSAS, INC. 4
T-MOBILE USA, INC. 2
BANDWIDTH.COM CLEC, LLC - AR 2
METROPCS, INC. 1
CENTURYLINK COMMUNICATIONS, 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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
— 501-333-0XXX 0000–0999Reserved WINDSTREAM ARKANSAS, INC. 1691 MAUMELLE AR
— 501-333-1XXX 1000–1999Reserved WINDSTREAM ARKANSAS, INC. 1691 MAUMELLE AR
— 501-333-2XXX 2000–2999Reserved WINDSTREAM ARKANSAS, INC. 1691 MAUMELLE AR
— 501-333-3XXX 3000–3999Reserved WINDSTREAM ARKANSAS, INC. 1691 MAUMELLE AR
2010-07-29 501-333-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 MAUMELLE AR
2018-08-21 501-333-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 MAUMELLE AR
2016-06-29 501-333-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F MAUMELLE AR
2014-11-25 501-333-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MAUMELLE AR
2018-08-21 501-333-8XXX 8000–8999Assigned METROPCS, INC. 5562 MAUMELLE AR
2019-02-04 501-333-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F MAUMELLE AR

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.