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 740
AT&T ENTERPRISES, LLC 57
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
2024-07-12 740-267-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C LEWISVILLE OH
2024-07-12 740-761-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C BETHESDA OH
2024-07-12 740-844-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C NORWICH OH
2023-09-19 740-419-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C MILLEDGEVL OH
2015-04-14 740-934-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C GRAYSVILLE OH
2013-10-28 740-242-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C THORNVILLE OH
2012-11-06 740-526-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C STCLAIRSVL OH
2012-11-06 740-575-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C COSHOCTON OH
2012-11-06 740-620-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C WSNGTNCTHS OH
2012-07-10 740-609-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C MARTISFRRY OH
2012-01-17 740-340-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C BELLAIRE OH
2011-10-24 740-300-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C NELSONVL OH
2011-09-23 740-240-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C RUSHVILLE OH
2011-09-23 740-280-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C PHILO OH
2011-09-23 740-301-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C RIO GRANDE OH
2011-09-23 740-309-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C BARNESVL OH
2011-09-23 740-343-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C NEWLXINGTN OH
2011-09-23 740-347-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CORNING OH
2011-09-23 740-394-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SHAWNEE OH
2011-09-23 740-401-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C BELPRE OH
2011-09-23 740-426-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C JEFFERSNVL OH
2011-09-23 740-473-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C NEWPORT OH
2011-09-23 740-483-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C DUFFY OH
2011-09-23 740-492-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C NEWCOMRSTN OH
2011-09-23 740-495-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C NEWHOLLAND OH
2011-09-23 740-535-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C MINGO JCT OH
2011-09-23 740-537-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C TORONTO OH
2011-09-23 740-565-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C DRESDEN OH
2011-09-23 740-659-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C GLENFORD OH
2011-09-23 740-693-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C WLAFAYETTE OH
2011-09-23 740-697-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C ROSEVILLE OH
2011-09-23 740-757-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SOMERTON OH
2011-09-23 740-836-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SOMERSET OH
2011-09-23 740-849-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C FULTONHAM OH
2011-09-23 740-864-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C NEWMTMORAS OH
2011-09-23 740-925-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C GALLIPOLIS OH
2011-09-23 740-926-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C BEALLSVL OH
2011-05-24 740-302-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C IRONTON OH
2011-05-24 740-346-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C STEUBENVL OH
2011-05-24 740-868-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C ZANESVILLE OH
2011-05-24 740-885-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C MARIETTA OH
2011-03-08 740-800-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C CARROLL OH
2010-12-10 740-217-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C WALNUT OH
2010-12-10 740-875-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C VINTON OH
2010-12-02 740-256-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C GUYAN OH
2010-12-02 740-318-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C SUGARGROVE OH
2010-12-02 740-519-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C CLARINGTON OH
2010-12-02 740-561-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C GNADENHTTN OH
2010-12-02 740-573-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C ARABIA OH
2010-12-02 740-673-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C UHRICHSVL OH

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.