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 810
AT&T ENTERPRISES, LLC 23
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
2015-07-02 810-768-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C FLINT MI
2013-05-29 810-259-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C FLINT MI
2011-11-16 810-740-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ST CLAIR MI
2011-06-15 810-712-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C CROSWELL MI
2011-05-18 810-294-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C PORT HURON MI
2011-05-18 810-378-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C PECK MI
2011-05-18 810-425-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C PT SANILAC MI
2011-05-18 810-512-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C ALGONAC MI
2011-05-18 810-537-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SANDUSKY MI
2011-05-18 810-643-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C MARINECITY MI
2011-05-18 810-657-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C CARSONVL MI
2011-05-18 810-672-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SNOVER MI
2011-05-18 810-674-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C APPLEGATE MI
2011-05-18 810-696-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C LEXINGTON MI
2006-11-03 810-207-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C HARTLAND MI
2006-11-01 810-370-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C BYRON MI
2006-11-01 810-522-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C BRIGHTON MI
2006-11-01 810-728-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C LAPEER MI
2006-06-12 810-820-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C FLINT MI
2006-02-02 810-344-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C GRANDBLANC MI
2006-02-02 810-519-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C FENTON MI
2006-02-02 810-547-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C CLIMTMORRS MI
2006-02-02 810-867-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C FLUSHING 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.