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 517
123.NET, LLC 22
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
2017-11-20 517-236-5XXX 5000–5999Assigned 123.NET, LLC 2550 DIMONDALE MI
2017-03-06 517-522-9XXX 9000–9999Assigned 123.NET, LLC 2550 GRASS LAKE MI
2017-01-31 517-726-8XXX 8000–8999Assigned 123.NET, LLC 2550 VERMONTVL MI
2015-08-05 517-852-7XXX 7000–7999Assigned 123.NET, LLC 2550 NASHVILLE MI
2015-07-13 517-939-3XXX 3000–3999Assigned 123.NET, LLC 2550 QUINCY MI
2011-09-02 517-458-5XXX 5000–5999Assigned 123.NET, LLC 2550 MORENCI MI
2011-05-20 517-883-9XXX 9000–9999Assigned 123.NET, LLC 2550 MASON MI
2010-04-21 517-626-8XXX 8000–8999Assigned 123.NET, LLC 2550 GRANDLEDGE MI
2009-02-19 517-441-2XXX 2000–2999Assigned 123.NET, LLC 2550 EATON RPD MI
2009-02-12 517-742-4XXX 4000–4999Assigned 123.NET, LLC 2550 HOLT MI
2005-01-28 517-668-7XXX 7000–7999Assigned 123.NET, LLC 2550 DE WITT MI
2003-02-26 517-992-0XXX 0000–0999Assigned 123.NET, LLC 2550 WILLIAMSTN MI
2003-02-19 517-736-3XXX 3000–3999Assigned 123.NET, LLC 2550 COLDWATER MI
2003-02-13 517-283-8XXX 8000–8999Assigned 123.NET, LLC 2550 READING MI
2003-02-13 517-531-2XXX 2000–2999Assigned 123.NET, LLC 2550 PARMA MI
2003-02-13 517-547-0XXX 0000–0999Assigned 123.NET, LLC 2550 ADDISON MI
2003-02-13 517-568-0XXX 0000–0999Assigned 123.NET, LLC 2550 HOMER MI
2003-02-12 517-448-9XXX 9000–9999Assigned 123.NET, LLC 2550 HUDSON MI
2003-01-02 517-292-8XXX 8000–8999Assigned 123.NET, LLC 2550 HOWELL MI
2003-01-02 517-682-9XXX 9000–9999Assigned 123.NET, LLC 2550 BLISSFIELD MI
2003-01-02 517-815-8XXX 8000–8999Assigned 123.NET, LLC 2550 TECUMSEH MI
2003-01-02 517-902-0XXX 0000–0999Assigned 123.NET, LLC 2550 ADRIAN 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.