Thousands-blocks in 504-303

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 504-303 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 504 blocks

Most active assignees, all time — NPA 504

VOICESTREAM GSM I, LLC 4

BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 2

ONVOY, LLC - LA 1

LEVEL 3 TELECOM OF LOUISIANA, LLC - LA 1

LEVEL 3 COMMUNICATIONS, LLC - LA 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
2007-09-04	504-303-0XXX	0000–0999	Assigned	VOICESTREAM GSM I, LLC	150C	KENNER	LA
2007-09-04	504-303-1XXX	1000–1999	Assigned	VOICESTREAM GSM I, LLC	150C	KENNER	LA
2007-09-04	504-303-2XXX	2000–2999	Assigned	VOICESTREAM GSM I, LLC	150C	KENNER	LA
—	504-303-3XXX	3000–3999	Reserved	AT&T - LOCAL	7421	KENNER	LA
2007-02-08	504-303-4XXX	4000–4999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - LA	3232	KENNER	LA
2007-03-23	504-303-5XXX	5000–5999	Assigned	LEVEL 3 TELECOM OF LOUISIANA, LLC - LA	7488	KENNER	LA
2008-04-07	504-303-6XXX	6000–6999	Assigned	BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL	9419	KENNER	LA
2008-04-07	504-303-7XXX	7000–7999	Assigned	BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL	9419	KENNER	LA
2008-05-15	504-303-8XXX	8000–8999	Assigned	ONVOY, LLC - LA	749E	KENNER	LA
2008-02-14	504-303-9XXX	9000–9999	Assigned	VOICESTREAM GSM I, LLC	150C	KENNER	LA

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.