NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 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, last 30 days — NPA 517
LEVEL 3 COMMUNICATIONS, LLC - MI 1
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
2026-09-01 517-447-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DEERFIELD MI
2026-08-20 517-692-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 SPRINGPORT MI
2023-02-13 517-239-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DE WITT MI
2022-03-01 517-855-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2021-01-12 517-885-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2020-03-11 517-237-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2018-04-24 517-921-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ADDISON MI
2018-01-03 517-566-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 SUNFIELD MI
2016-02-18 517-220-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2015-12-09 517-220-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2015-12-04 517-200-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LITCHFIELD MI
2015-12-04 517-790-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MOSHERVL MI
2015-07-29 517-706-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2015-07-07 517-539-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 JACKSON MI
2015-06-23 517-940-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2015-04-01 517-940-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2014-10-01 517-336-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2014-06-04 517-253-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2014-05-21 517-580-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2014-04-17 517-731-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 GRANDLEDGE MI
2014-03-27 517-481-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2014-02-07 517-435-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 JACKSON MI
2014-01-15 517-662-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ADRIAN MI
2013-03-20 517-325-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2013-01-10 517-301-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 TECUMSEH MI
2012-10-17 517-325-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2012-05-30 517-682-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BLISSFIELD MI
2012-05-18 517-721-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2012-01-31 517-798-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HOWELL MI
2012-01-30 517-366-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ADRIAN MI
2011-12-14 517-936-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 JACKSON MI
2011-06-08 517-908-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2010-12-16 517-489-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2010-11-01 517-489-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2010-07-23 517-580-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2010-05-12 517-215-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ADRIAN MI
2010-03-03 517-325-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2009-11-17 517-459-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PARMA MI
2009-11-17 517-731-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 GRANDLEDGE MI
2009-11-12 517-521-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WEBBERVL MI
2009-11-11 517-522-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 GRASS LAKE MI
2009-11-11 517-992-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WILLIAMSTN MI
2009-09-23 517-879-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 JACKSON MI
2009-09-04 517-908-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2008-09-17 517-305-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 CLARKLAKE MI
2008-09-05 517-306-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HUDSON MI
2008-05-07 517-441-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 EATON RPD MI
2008-05-07 517-878-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LESLIE MI
2008-05-01 517-292-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HOWELL MI
2008-04-28 517-969-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MASON MI

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.