NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 260-503

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 260-503 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 260 blocks

Most active assignees, all time — NPA 260
T-MOBILE USA, INC. 4
METROPCS, INC. 2
ONVOY, LLC - IN 1
NEW CINGULAR WIRELESS PCS, LLC - IL 1
LEVEL 3 COMMUNICATIONS, LLC - IN 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
2003-12-19 260-503-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 COLUMBIACY IN
— 260-503-1XXX 1000–1999Reserved METROPCS, INC. 5562 COLUMBIACY IN
2021-06-11 260-503-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - IN 105F COLUMBIACY IN
2021-08-05 260-503-3XXX 3000–3999Assigned ONVOY, LLC - IN 097D COLUMBIACY IN
2008-05-28 260-503-4XXX 4000–4999Assigned METROPCS, INC. 5562 COLUMBIACY IN
2003-04-22 260-503-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 COLUMBIACY IN
2020-06-25 260-503-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 COLUMBIACY IN
2011-04-19 260-503-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 COLUMBIACY IN
2012-01-18 260-503-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBIACY IN
— 260-503-9XXX 9000–9999Reserved T-MOBILE USA, INC. 6529 COLUMBIACY IN

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.