NumberResearch Membership · Data 09/23/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/23/2026

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 815
ILLINOIS BELL TEL CO 37
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
2011-03-24 815-300-0XXX 0000–0999Assigned ILLINOIS BELL TEL CO 9329 NEW LENOX IL
2011-03-24 815-300-1XXX 1000–1999Assigned ILLINOIS BELL TEL CO 9329 NEW LENOX IL
2011-03-24 815-300-7XXX 7000–7999Assigned ILLINOIS BELL TEL CO 9329 NEW LENOX IL
2011-03-24 815-300-8XXX 8000–8999Assigned ILLINOIS BELL TEL CO 9329 NEW LENOX IL
2011-03-24 815-300-9XXX 9000–9999Assigned ILLINOIS BELL TEL CO 9329 NEW LENOX IL
2010-12-23 815-300-2XXX 2000–2999Assigned ILLINOIS BELL TEL CO 9329 NEW LENOX IL
2010-12-23 815-300-3XXX 3000–3999Assigned ILLINOIS BELL TEL CO 9329 NEW LENOX IL
2010-12-23 815-300-4XXX 4000–4999Assigned ILLINOIS BELL TEL CO 9329 NEW LENOX IL
2010-12-23 815-300-5XXX 5000–5999Assigned ILLINOIS BELL TEL CO 9329 NEW LENOX IL
2010-12-23 815-300-6XXX 6000–6999Assigned ILLINOIS BELL TEL CO 9329 NEW LENOX IL
2008-03-07 815-290-7XXX 7000–7999Assigned ILLINOIS BELL TEL CO 9329 MINOOKA IL
2006-08-24 815-267-4XXX 4000–4999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2006-02-22 815-731-0XXX 0000–0999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2006-02-22 815-731-1XXX 1000–1999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2006-02-22 815-731-2XXX 2000–2999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2006-02-22 815-731-3XXX 3000–3999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2006-02-22 815-731-4XXX 4000–4999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2006-02-22 815-731-5XXX 5000–5999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2006-02-22 815-731-6XXX 6000–6999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2006-02-22 815-731-7XXX 7000–7999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2006-02-22 815-731-8XXX 8000–8999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2006-02-22 815-731-9XXX 9000–9999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2005-11-30 815-319-4XXX 4000–4999Assigned ILLINOIS BELL TEL CO 9329 ROCKFORD IL
2005-11-30 815-319-6XXX 6000–6999Assigned ILLINOIS BELL TEL CO 9329 ROCKFORD IL
2005-11-18 815-267-7XXX 7000–7999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2005-11-18 815-267-8XXX 8000–8999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2005-08-01 815-315-6XXX 6000–6999Assigned ILLINOIS BELL TEL CO 9329 ROCKFORD IL
2005-05-31 815-230-4XXX 4000–4999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2004-12-09 815-230-3XXX 3000–3999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2004-08-24 815-230-2XXX 2000–2999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2004-03-12 815-267-3XXX 3000–3999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2003-04-11 815-614-4XXX 4000–4999Assigned ILLINOIS BELL TEL CO 9329 KANKAKEE IL
2003-04-11 815-614-6XXX 6000–6999Assigned ILLINOIS BELL TEL CO 9329 KANKAKEE IL
2003-04-11 815-614-7XXX 7000–7999Assigned ILLINOIS BELL TEL CO 9329 KANKAKEE IL
2002-11-19 815-516-2XXX 2000–2999Assigned ILLINOIS BELL TEL CO 9329 ROCKFORD IL
2002-09-10 815-207-4XXX 4000–4999Assigned ILLINOIS BELL TEL CO 9329 JOLIET IL
2002-09-10 815-207-5XXX 5000–5999Assigned ILLINOIS BELL TEL CO 9329 JOLIET IL

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.