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 872
AT&T ENTERPRISES, LLC 20
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
2022-03-09 872-946-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN03 IL
2016-09-27 872-254-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN08 IL
2016-06-15 872-231-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN05 IL
2015-05-21 872-818-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN07 IL
2015-01-21 872-241-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN02 IL
2015-01-21 872-817-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN04 IL
2014-10-23 872-818-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN07 IL
2014-10-08 872-267-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN08 IL
2014-10-07 872-281-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN06 IL
2014-07-25 872-256-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN05 IL
2014-07-08 872-356-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN10 IL
2014-05-02 872-806-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN02 IL
2014-03-17 872-666-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN09 IL
2014-02-28 872-802-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN04 IL
2014-02-13 872-465-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN07 IL
2013-03-12 872-208-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN02 IL
2013-02-26 872-244-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN07 IL
2013-02-20 872-207-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN08 IL
2011-09-21 872-444-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN06 IL
2011-07-01 872-244-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN07 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.