Thousands-blocks in 574-356

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 574-356 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

T-MOBILE USA, INC. 3

ONVOY, LLC - IN 3

FRACTEL, LLC 1

FBN INDIANA, INC. - IN 1

BOOST SUBSCRIBERCO L.L.C. 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

Recent thousands-block assignments
Assigned	Thousands-block	Last 4 digits	Status	Assignee	OCN	Rate center	State
2004-02-26	574-356-0XXX	0000–0999	Assigned	FBN INDIANA, INC. - IN	4117	NAPPANEE	IN
2023-04-07	574-356-1XXX	1000–1999	Assigned	T-MOBILE USA, INC.	6529	NAPPANEE	IN
—	574-356-2XXX	2000–2999	Available			NAPPANEE	IN
2021-08-05	574-356-3XXX	3000–3999	Assigned	ONVOY, LLC - IN	097D	NAPPANEE	IN
2024-02-05	574-356-4XXX	4000–4999	Assigned	ONVOY, LLC - IN	097D	NAPPANEE	IN
2023-05-26	574-356-5XXX	5000–5999	Assigned	BOOST SUBSCRIBERCO L.L.C.	490J	NAPPANEE	IN
2003-12-01	574-356-6XXX	6000–6999	Assigned	T-MOBILE USA, INC.	6529	NAPPANEE	IN
2020-08-20	574-356-7XXX	7000–7999	Assigned	FRACTEL, LLC	965H	NAPPANEE	IN
2006-10-04	574-356-8XXX	8000–8999	Assigned	T-MOBILE USA, INC.	6529	NAPPANEE	IN
2023-07-14	574-356-9XXX	9000–9999	Assigned	ONVOY, LLC - IN	097D	NAPPANEE	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.