NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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 314
AT&T ENTERPRISES, LLC 25
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
2016-07-13 314-731-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C LADUE MO
2015-07-31 314-274-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C LADUE MO
2015-07-13 314-730-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C SAPPINGTON MO
2015-02-27 314-379-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ST LOUIS MO
2015-01-29 314-279-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C LADUE MO
2014-09-05 314-339-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ST LOUIS MO
2014-08-21 314-714-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C MEHLVILLE MO
2014-07-14 314-325-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C LADUE MO
2014-06-03 314-240-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ST LOUIS MO
2014-03-05 314-801-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C LADUE MO
2014-01-21 314-224-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ST LOUIS MO
2013-07-05 314-738-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C LADUE MO
2012-12-20 314-300-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C ST LOUIS MO
2012-10-30 314-942-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C LADUE MO
2011-12-27 314-287-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C KIRKWOOD MO
2011-10-20 314-594-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C CREVECOEUR MO
2011-06-17 314-475-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C LADUE MO
2011-03-25 314-282-0XXX 0000–0999Assigned AT&T ENTERPRISES, LLC 516C ST LOUIS MO
2010-08-16 314-716-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C LADUE MO
2009-12-29 314-925-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C ST LOUIS MO
2009-12-09 314-716-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C LADUE MO
2006-06-09 314-722-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C SAPPINGTON MO
2006-06-08 314-786-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CREVECOEUR MO
2006-03-13 314-375-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C OAKVILLE MO
2006-01-16 314-329-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C MEHLVILLE MO

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.