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 815
AT&T ENTERPRISES, LLC 36
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
2015-03-06 815-691-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C UTICA IL
2013-03-13 815-329-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C ROCKFORD IL
2013-01-25 815-237-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C GARDNER IL
2013-01-25 815-465-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C GRANT PARK IL
2011-10-18 815-268-0XXX 0000–0999Assigned AT&T ENTERPRISES, LLC 516C ONARGA IL
2011-10-18 815-320-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C NEW LENOX IL
2011-10-18 815-374-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C DWIGHT IL
2011-10-18 815-426-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C HERSCHER IL
2011-10-18 815-427-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C ST ANNE IL
2011-10-18 815-506-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C UNION IL
2011-10-18 815-507-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C MOMENCE IL
2011-10-18 815-681-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C OGLESBY IL
2011-10-18 815-707-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C GILMAN IL
2011-10-18 815-709-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C COAL CITY IL
2011-10-18 815-710-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C MORRIS IL
2011-10-18 815-769-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C SENECA IL
2011-10-18 815-785-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C WATSEKA IL
2011-05-19 815-324-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C OTTAWA IL
2011-05-19 815-390-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C BRAIDWOOD IL
2011-05-19 815-410-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C LA SALLE IL
2011-05-19 815-448-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C MAZON IL
2011-05-19 815-887-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C HARVARD IL
2010-04-23 815-782-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C PLAINFIELD IL
2006-11-01 815-418-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C MANHATTAN IL
2006-11-01 815-424-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ELWOOD IL
2006-11-01 815-524-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C LOCKPORT IL
2006-11-01 815-782-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C PLAINFIELD IL
2006-02-15 815-290-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C MINOOKA IL
2006-02-15 815-596-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C MARENGO IL
2006-02-03 815-403-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C MCHENRY IL
2006-02-03 815-527-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C WOODSTOCK IL
2006-02-03 815-806-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C FRANKFORT IL
2006-02-02 815-573-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C KANKAKEE IL
2006-02-02 815-893-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C CRYSTAL LK IL
2005-09-02 815-409-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C JOLIET IL
2005-04-19 815-847-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C ROCKFORD IL

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.