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 224
LEVEL 3 COMMUNICATIONS, LLC - IL 160
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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2020-05-05 224-342-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ARLIGTNHTS IL
2020-02-28 224-278-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ROSELLE IL
2019-10-16 224-842-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 LIBERTYVL IL
2019-04-17 224-607-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ARLIGTNHTS IL
2018-08-06 224-322-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ARLIGTNHTS IL
2018-01-18 224-570-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 WAUKEGAN IL
2018-01-18 224-570-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 WAUKEGAN IL
2016-03-11 224-877-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ELK GROVE IL
2015-12-14 224-857-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ARLIGTNHTS IL
2015-08-12 224-857-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ARLIGTNHTS IL
2014-10-02 224-478-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 DESPLAINES IL
2014-09-26 224-706-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 LAKEFOREST IL
2014-09-11 224-265-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ELK GROVE IL
2014-04-01 224-404-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ELK GROVE IL
2014-03-26 224-804-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 DEERFIELD IL
2014-02-06 224-633-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 BARRINGTON IL
2014-01-29 224-310-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ARLIGTNHTS IL
2014-01-29 224-318-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ARLIGTNHTS IL
2013-12-18 224-315-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 DESPLAINES IL
2013-11-07 224-413-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 WAUKEGAN IL
2013-10-17 224-412-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 NORTHBROOK IL
2013-06-27 224-205-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 NORTHBROOK IL
2013-05-30 224-404-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ELK GROVE IL
2013-02-21 224-231-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ROSELLE IL
2013-02-21 224-231-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ROSELLE IL
2012-12-21 224-215-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 WILMETTE IL
2012-12-17 224-231-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ROSELLE IL
2012-11-29 224-301-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 DESPLAINES IL
2012-11-15 224-803-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 NORTHBROOK IL
2012-11-08 224-206-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 LIBERTYVL IL
2012-11-08 224-360-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 MUNDELEIN IL
2012-11-06 224-267-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ANTIOCH IL
2012-10-16 224-541-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 GRAYSLAKE IL
2012-10-16 224-875-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ELK GROVE IL
2012-07-10 224-803-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 NORTHBROOK IL
2012-05-24 224-324-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ARLIGTNHTS IL
2012-04-23 224-215-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 WILMETTE IL
2012-04-10 224-205-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 NORTHBROOK IL
2012-04-10 224-205-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 NORTHBROOK IL
2012-03-27 224-214-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 WAUKEGAN IL
2012-02-09 224-836-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PALATINE IL
2012-01-27 224-255-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 WINNETKA IL
2012-01-27 224-900-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 WHEELING IL
2011-12-21 224-276-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ELGIN IL
2011-12-14 224-935-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 SKOKIE IL
2011-12-08 224-250-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 DESPLAINES IL
2011-12-08 224-880-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 LAKEFOREST IL
2011-12-07 224-888-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CARY IL
2011-12-01 224-655-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 BARRINGTON IL
2011-10-28 224-993-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 WAUCONDA IL

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.