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 256
AT&T ENTERPRISES, LLC 48
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
2017-01-25 256-532-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C HUNTSVILLE AL
2016-10-24 256-297-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C CULLMAN AL
2016-08-22 256-445-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C DECATUR AL
2016-07-27 256-800-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C ATHENS AL
2015-10-20 256-669-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C COURTLAND AL
2015-09-01 256-858-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C HUNTSVILLE AL
2014-11-03 256-342-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ANNISTON AL
2014-06-19 256-970-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C HUNTSVILLE AL
2013-08-08 256-576-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C LEIGHTON AL
2013-02-21 256-409-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C ALEXANDRCY AL
2013-02-21 256-487-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C SYLACAUGA AL
2012-11-29 256-548-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C STEVENSON AL
2012-11-29 256-695-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C BRIDGEPORT AL
2011-09-16 256-573-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C TOWN CREEK AL
2011-09-16 256-607-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C ROGERSVL AL
2011-09-16 256-789-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C LEXINGTON AL
2011-05-19 256-448-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C FRANCISCO AL
2011-05-19 256-887-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C HANCEVILLE AL
2011-01-24 256-568-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C RANBURNE AL
2011-01-24 256-579-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C FRUITHURST AL
2011-01-13 256-812-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C GURLEY AL
2010-10-05 256-373-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C DADEVILLE AL
2010-10-05 256-480-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C TALLADEGA AL
2010-10-05 256-581-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C OHATCHEE AL
2010-10-05 256-645-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C PIEDMONT AL
2010-10-04 256-346-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C CHILDERSBG AL
2010-07-20 256-275-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C FLORENCE AL
2010-07-20 256-778-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C HARTSELLE AL
2010-07-16 256-262-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C ATHENS AL
2010-07-16 256-272-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C KILLEN AL
2010-07-16 256-277-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C RUSSELLVL AL
2010-07-16 256-281-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C BOAZ AL
2010-07-16 256-314-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C SHEFFIELD AL
2010-07-16 256-465-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C FORT PAYNE AL
2010-07-16 256-522-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C MOULTON AL
2010-07-16 256-542-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C MADISON AL
2010-07-16 256-580-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C DECATUR AL
2010-07-16 256-735-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C CULLMAN AL
2010-07-16 256-813-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C HAZELGREEN AL
2010-07-16 256-960-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C GUNTERSVL AL
2009-12-23 256-733-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C MUNFORD AL
2009-12-23 256-857-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C ALBERTVL AL
2009-12-23 256-945-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C HUNTSVILLE AL
2009-10-21 256-344-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ATTALLA AL
2009-07-24 256-459-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C GADSDEN AL
2009-07-24 256-624-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C ANNISTON AL
2009-07-24 256-644-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C JACKSONVL AL
2009-06-18 256-472-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C VETO AL

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.