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 972
LEVEL 3 COMMUNICATIONS, LLC - TX 178
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
2019-11-20 972-645-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ITALY TX
2019-06-19 972-666-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BRISTOL TX
2019-03-12 972-842-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FERRIS TX
2018-04-19 972-942-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX
2018-04-19 972-942-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX
2018-01-15 972-645-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ITALY TX
2017-08-14 972-982-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX
2017-06-09 972-214-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FRISCO TX
2016-09-26 972-430-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BLUE RIDGE TX
2015-12-11 972-402-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX
2015-04-16 972-737-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ALLEN TX
2015-01-21 972-597-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ITALY TX
2014-11-20 972-627-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 AVALON TX
2014-05-30 972-388-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX
2014-05-30 972-684-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX
2014-04-25 972-848-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 WILMER TX
2014-04-18 972-362-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX
2014-04-18 972-362-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX
2014-04-18 972-362-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX
2014-04-18 972-362-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX
2014-04-18 972-362-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX
2014-02-24 972-460-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 CEDAR HILL TX
2013-10-17 972-457-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 IRVING TX
2013-10-11 972-810-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 CARROLLTON TX
2013-10-03 972-833-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FERRIS TX
2013-07-24 972-382-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 CELINA TX
2013-07-03 972-954-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ALLEN TX
2013-06-05 972-346-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 PROSPER TX
2013-01-23 972-885-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX
2013-01-23 972-885-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX
2013-01-23 972-885-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX
2013-01-23 972-885-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX
2012-12-18 972-597-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ITALY TX
2012-11-15 972-914-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 NEVADA TX
2012-03-13 972-435-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 MAYPEARL TX
2012-02-17 972-441-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 WILMER TX
2012-02-17 972-954-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ALLEN TX
2012-02-10 972-299-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 CEDAR HILL TX
2012-01-26 972-784-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FARMERSVL TX
2012-01-26 972-810-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 CARROLLTON TX
2012-01-26 972-845-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 PALMER TX
2011-09-22 972-471-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 LEWISVILLE TX
2011-09-20 972-332-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ALLEN TX
2011-08-05 972-360-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 CARROLLTON TX
2011-07-27 972-916-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 IRVING TX
2011-07-21 972-375-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 GRANDPRARI TX
2011-07-14 972-330-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ENNIS TX
2011-05-31 972-210-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 TERRELL TX
2011-05-31 972-564-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORNEY TX
2011-05-26 972-528-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX

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.