NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 504-667

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 504-667 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
ONVOY SPECTRUM, LLC 4
ONVOY, LLC - LA 2
LEVEL 3 COMMUNICATIONS, LLC - LA 2
TELEPORT COMMUNICATIONS AMERICA LA - LLC 1
AT&T ENTERPRISES, 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
2023-10-20 504-667-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H KENNER LA
2009-01-09 504-667-1XXX 1000–1999Assigned ONVOY, LLC - LA 749E KENNER LA
2009-11-23 504-667-2XXX 2000–2999Assigned ONVOY, LLC - LA 749E KENNER LA
2009-07-07 504-667-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C KENNER LA
2009-02-18 504-667-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA LA - LLC 653C KENNER LA
2006-01-18 504-667-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - LA 3232 KENNER LA
2006-01-18 504-667-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - LA 3232 KENNER LA
2023-10-20 504-667-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H KENNER LA
2023-10-20 504-667-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H KENNER LA
2023-10-20 504-667-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H KENNER LA

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.