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 312
FIRST COMMUNICATIONS, LLC 114
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
2017-05-22 312-319-7XXX 7000–7999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2016-12-09 312-469-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2016-07-05 312-824-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2016-05-24 312-837-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2016-02-29 312-989-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2015-08-18 312-964-9XXX 9000–9999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2015-04-27 312-897-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2015-02-10 312-690-8XXX 8000–8999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2014-11-05 312-487-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2014-09-10 312-995-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2014-08-04 312-690-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2014-05-22 312-635-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2014-04-09 312-788-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2013-12-20 312-561-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2013-12-18 312-999-9XXX 9000–9999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2013-08-28 312-801-8XXX 8000–8999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2013-06-25 312-626-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2013-04-17 312-561-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2012-12-11 312-374-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2012-10-08 312-605-9XXX 9000–9999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2012-04-03 312-448-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2012-02-16 312-216-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2011-06-09 312-386-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2011-06-08 312-648-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2011-06-08 312-788-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2011-06-08 312-880-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2010-09-15 312-912-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2010-05-07 312-237-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2010-02-17 312-291-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2009-09-03 312-476-8XXX 8000–8999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2009-02-19 312-582-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2009-01-02 312-256-8XXX 8000–8999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2008-12-16 312-444-8XXX 8000–8999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2008-03-18 312-447-8XXX 8000–8999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2008-03-18 312-506-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2007-07-16 312-784-0XXX 0000–0999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2007-07-16 312-784-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2007-07-16 312-784-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2007-07-16 312-784-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2007-07-16 312-784-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2007-07-16 312-784-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2007-07-16 312-784-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2007-07-16 312-784-7XXX 7000–7999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2007-07-16 312-784-8XXX 8000–8999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2007-07-16 312-784-9XXX 9000–9999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2007-06-26 312-662-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2007-06-26 312-662-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2007-06-26 312-662-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2007-06-26 312-662-7XXX 7000–7999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-11-20 312-564-0XXX 0000–0999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 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.