NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

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

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, all time — NPA 504
AT&T ENTERPRISES, LLC 19
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
2016-07-28 504-226-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C NEWORLEANS LA
2016-07-07 504-226-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C NEWORLEANS LA
2015-03-26 504-510-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C NEWORLEANS LA
2014-12-15 504-510-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C NEWORLEANS LA
2014-10-31 504-510-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C NEWORLEANS LA
2014-10-01 504-336-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C KENNER LA
2014-08-12 504-702-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C NEWORLEANS LA
2014-03-14 504-475-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C NEWORLEANS LA
2013-11-13 504-592-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C NEWORLEANS LA
2013-03-27 504-533-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C NEWORLEANS LA
2012-10-26 504-405-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C KENNER LA
2012-01-12 504-407-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C NEWORLEANS LA
2011-09-23 504-233-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C LAFITTE LA
2011-09-23 504-814-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C VENICE LA
2011-07-18 504-571-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C NEWORLEANS LA
2011-04-29 504-656-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C JESUITBEND LA
2011-01-12 504-345-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C NEWORLEANS LA
2009-07-07 504-667-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C KENNER LA
2009-06-09 504-264-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C NEWORLEANS 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.