NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 574-540

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The ten 1,000-number thousand-blocks inside prefix 574-540 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 574 blocks

Most active assignees, all time — NPA 574
METROPCS, INC. 5
ONVOY, LLC - IN 2
OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 1
FBN INDIANA, INC. - IN 1
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
2004-02-26 574-540-0XXX 0000–0999Assigned FBN INDIANA, INC. - IN 4117 PLYMOUTH IN
— 574-540-1XXX 1000–1999Reserved METROPCS, INC. 5562 PLYMOUTH IN
2005-08-03 574-540-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J PLYMOUTH IN
— 574-540-3XXX 3000–3999Reserved METROPCS, INC. 5562 PLYMOUTH IN
2021-08-05 574-540-4XXX 4000–4999Assigned ONVOY, LLC - IN 097D PLYMOUTH IN
2021-08-05 574-540-5XXX 5000–5999Assigned ONVOY, LLC - IN 097D PLYMOUTH IN
— 574-540-6XXX 6000–6999Reserved METROPCS, INC. 5562 PLYMOUTH IN
2011-02-22 574-540-7XXX 7000–7999Assigned METROPCS, INC. 5562 PLYMOUTH IN
2012-07-09 574-540-8XXX 8000–8999Assigned METROPCS, INC. 5562 PLYMOUTH IN
— 574-540-9XXX 9000–9999Reserved OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 PLYMOUTH IN

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.