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 313
123.NET, LLC 12
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
2021-01-25 313-756-8XXX 8000–8999Assigned 123.NET, LLC 2550 DETROITZN1 MI
2021-01-25 313-756-9XXX 9000–9999Assigned 123.NET, LLC 2550 DETROITZN1 MI
2012-11-16 313-438-5XXX 5000–5999Assigned 123.NET, LLC 2550 DETROITZN6 MI
2011-09-02 313-446-8XXX 8000–8999Assigned 123.NET, LLC 2550 DETROITZN1 MI
2011-01-28 313-448-9XXX 9000–9999Assigned 123.NET, LLC 2550 DETROITZN1 MI
2011-01-19 313-626-2XXX 2000–2999Assigned 123.NET, LLC 2550 DETROITZN2 MI
2008-03-19 313-270-9XXX 9000–9999Assigned 123.NET, LLC 2550 DETROITZN4 MI
2008-02-12 313-543-8XXX 8000–8999Assigned 123.NET, LLC 2550 DETROITZN5 MI
2008-02-12 313-733-0XXX 0000–0999Assigned 123.NET, LLC 2550 DETROITZN3 MI
2003-01-02 313-228-0XXX 0000–0999Assigned 123.NET, LLC 2550 DETROITZN6 MI
2003-01-02 313-263-0XXX 0000–0999Assigned 123.NET, LLC 2550 DETROITZN1 MI
2003-01-02 313-347-2XXX 2000–2999Assigned 123.NET, LLC 2550 DETROITZN2 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.