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 817
LEVEL 3 COMMUNICATIONS, LLC - TX 136
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
2024-04-23 817-973-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
2016-09-22 817-813-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 AZLE TX
2016-03-30 817-402-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ALVARADO TX
2015-03-06 817-286-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ATLAS TX
2014-11-20 817-242-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 GODLEY TX
2014-11-20 817-373-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 RIO VISTA TX
2014-11-20 817-904-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ACTON TX
2014-06-23 817-539-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 MANSFIELD TX
2014-04-22 817-383-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 RHOME TX
2014-03-25 817-912-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 GRAPEVINE TX
2014-01-10 817-484-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
2014-01-10 817-502-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
2013-05-24 817-756-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 GRAPEVINE TX
2013-04-11 817-609-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 WEATHERFD TX
2012-08-03 817-755-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 SPRINGTOWN TX
2012-05-24 817-310-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 GRAPEVINE TX
2012-02-17 817-900-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
2012-02-17 817-953-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
2012-01-26 817-606-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ARLINGTON TX
2012-01-26 817-678-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 KENNEDALE TX
2012-01-26 817-912-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 GRAPEVINE TX
2011-12-08 817-754-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 RENO TX
2011-11-30 817-653-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 GLENDALE TX
2011-11-30 817-857-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 EULESS TX
2011-11-30 817-993-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 KELLER TX
2011-10-20 817-591-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ATLAS TX
2011-10-12 817-865-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 GRAPEVINE TX
2011-10-05 817-755-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 SPRINGTOWN TX
2011-09-12 817-756-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 GRAPEVINE TX
2011-07-27 817-330-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 KENNEDALE TX
2011-07-27 817-494-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 EULESS TX
2011-03-15 817-442-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 GRAPEVINE TX
2011-03-08 817-494-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 EULESS TX
2011-02-17 817-402-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ALVARADO TX
2010-12-15 817-422-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ARLINGTON TX
2010-12-15 817-962-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ARLINGTON TX
2010-11-18 817-768-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
2010-11-18 817-769-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
2010-11-18 817-840-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
2010-10-28 817-438-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 EULESS TX
2010-10-27 817-203-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 GRAPEVINE TX
2010-08-26 817-484-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
2010-08-26 817-484-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
2010-05-11 817-880-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 GLENDALE TX
2009-11-04 817-900-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
2009-08-18 817-500-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 NRICHLDHLS TX
2008-11-26 817-841-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
2008-11-26 817-900-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
2008-09-30 817-668-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 SPRINGTOWN TX
2008-09-30 817-725-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TX 6114 RENO 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.