Thousands-blocks in 870-333

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 870-333 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 870 blocks

Most active assignees, all time — NPA 870

T-MOBILE USA, INC. 3

E. RITTER COMMUNICATIONS, LLC 3

SOUTHWESTERN BELL 1

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

Recent thousands-block assignments
Assigned	Thousands-block	Last 4 digits	Status	Assignee	OCN	Rate center	State
2016-07-26	870-333-0XXX	0000–0999	Assigned	T-MOBILE USA, INC.	6529	JONESBORO	AR
2014-03-07	870-333-1XXX	1000–1999	Assigned	E. RITTER COMMUNICATIONS, LLC	128L	JONESBORO	AR
2014-09-02	870-333-2XXX	2000–2999	Assigned	E. RITTER COMMUNICATIONS, LLC	128L	JONESBORO	AR
2015-03-05	870-333-3XXX	3000–3999	Assigned	METROPCS, INC.	5562	JONESBORO	AR
2009-07-27	870-333-4XXX	4000–4999	Assigned	SOUTHWESTERN BELL	9533	JONESBORO	AR
2015-12-24	870-333-5XXX	5000–5999	Assigned	E. RITTER COMMUNICATIONS, LLC	128L	JONESBORO	AR
2016-07-26	870-333-6XXX	6000–6999	Assigned	T-MOBILE USA, INC.	6529	JONESBORO	AR
2014-08-28	870-333-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	JONESBORO	AR
2016-07-26	870-333-8XXX	8000–8999	Assigned	T-MOBILE USA, INC.	6529	JONESBORO	AR
—	870-333-9XXX	9000–9999	Reserved	AT&T - LOCAL	7421	JONESBORO	AR

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.