NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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
ACCESS ONE, INC. - IL 25
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
2018-02-16 312-380-7XXX 7000–7999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2018-02-16 312-736-1XXX 1000–1999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2015-10-14 312-517-1XXX 1000–1999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2014-04-16 312-566-4XXX 4000–4999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2013-12-19 312-374-5XXX 5000–5999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2013-11-12 312-888-4XXX 4000–4999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2013-06-04 312-585-1XXX 1000–1999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2012-09-13 312-605-8XXX 8000–8999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2012-03-02 312-216-2XXX 2000–2999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2011-12-02 312-202-3XXX 3000–3999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2011-02-02 312-477-7XXX 7000–7999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2011-02-02 312-477-8XXX 8000–8999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2010-06-17 312-574-1XXX 1000–1999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2010-06-17 312-582-2XXX 2000–2999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2009-08-10 312-450-8XXX 8000–8999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2009-08-10 312-460-3XXX 3000–3999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2009-01-22 312-348-1XXX 1000–1999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2009-01-22 312-521-5XXX 5000–5999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2008-03-11 312-445-4XXX 4000–4999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2008-03-11 312-445-5XXX 5000–5999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2007-08-27 312-768-4XXX 4000–4999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2007-08-27 312-768-6XXX 6000–6999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2007-01-04 312-344-2XXX 2000–2999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2007-01-04 312-544-8XXX 8000–8999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2005-12-01 312-265-9XXX 9000–9999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.