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 815
FIRST COMMUNICATIONS, LLC 99
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
2014-08-27 815-293-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K LOCKPORT IL
2014-08-27 815-372-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K LOCKPORT IL
2014-08-27 815-407-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K LOCKPORT IL
2014-04-08 815-661-8XXX 8000–8999Assigned FIRST COMMUNICATIONS, LLC 460K MORRIS IL
2014-04-04 815-552-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K LOCKPORT IL
2012-12-14 815-705-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K MORRIS IL
2012-06-07 815-705-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K MORRIS IL
2012-06-07 815-705-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K MORRIS IL
2012-06-07 815-705-7XXX 7000–7999Assigned FIRST COMMUNICATIONS, LLC 460K MORRIS IL
2010-12-02 815-526-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CRYSTAL LK IL
2010-08-26 815-679-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K MCHENRY IL
2010-05-18 815-651-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K JOLIET IL
2010-04-29 815-999-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K JOLIET IL
2010-04-29 815-999-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K JOLIET IL
2010-04-23 815-514-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K JOLIET IL
2010-03-11 815-348-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K KANKAKEE IL
2009-04-07 815-463-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K NEW LENOX IL
2009-02-20 815-534-7XXX 7000–7999Assigned FIRST COMMUNICATIONS, LLC 460K FRANKFORT IL
2008-04-14 815-534-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K FRANKFORT IL
2007-11-08 815-314-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K MANHATTAN IL
2007-11-08 815-802-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K KANKAKEE IL
2007-11-08 815-944-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K MOMENCE IL
2007-09-07 815-417-7XXX 7000–7999Assigned FIRST COMMUNICATIONS, LLC 460K BRAIDWOOD IL
2006-07-03 815-448-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K MAZON IL
2006-04-13 815-349-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K MCHENRY IL
2006-04-13 815-416-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K MORRIS IL
2005-06-22 815-321-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K WOODSTOCK IL
2005-05-18 815-893-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K CRYSTAL LK IL
2005-02-22 815-221-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K LOCKPORT IL
2005-02-22 815-277-8XXX 8000–8999Assigned FIRST COMMUNICATIONS, LLC 460K FRANKFORT IL
2005-02-22 815-317-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K CRESCENTCY IL
2005-02-22 815-318-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K MORRIS IL
2005-02-22 815-322-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K MCHENRY IL
2005-02-22 815-410-7XXX 7000–7999Assigned FIRST COMMUNICATIONS, LLC 460K LA SALLE IL
2005-02-22 815-531-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K JOLIET IL
2005-02-22 815-556-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K PLAINFIELD IL
2005-02-22 815-587-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K OTTAWA IL
2005-02-22 815-828-8XXX 8000–8999Assigned FIRST COMMUNICATIONS, LLC 460K MINOOKA IL
2005-01-30 815-215-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K NEW LENOX IL
2005-01-30 815-269-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K DANFORTH IL
2005-01-30 815-404-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K CRYSTAL LK IL
2005-01-30 815-531-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K JOLIET IL
2005-01-26 815-214-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K KANKAKEE IL
2005-01-26 815-237-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K GARDNER IL
2005-01-26 815-267-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K PLAINFIELD IL
2005-01-26 815-271-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K MCHENRY IL
2005-01-26 815-280-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K JOLIET IL
2005-01-26 815-306-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K LOCKPORT IL
2005-01-26 815-308-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K WOODSTOCK IL
2005-01-26 815-313-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K OTTAWA IL

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.