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 248
AT&T ENTERPRISES, LLC 34
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
2017-01-03 248-450-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C SOUTHFIELD MI
2016-08-12 248-617-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C SOUTH LYON MI
2016-07-08 248-710-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C ROCHESTER MI
2016-06-17 248-326-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C PONTIAC MI
2015-03-03 248-956-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C WALLEDLAKE MI
2015-01-09 248-607-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C ROYAL OAK MI
2014-09-26 248-516-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C FARMINGTON MI
2014-07-21 248-221-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C PONTIAC MI
2014-04-02 248-281-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C SOUTHFIELD MI
2014-02-20 248-385-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C BIRMINGHAM MI
2011-10-21 248-862-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C W BLOOMFLD MI
2011-08-30 248-513-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C NORTHVILLE MI
2011-05-03 248-677-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C ROYAL OAK MI
2010-08-24 248-622-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C PONTIAC MI
2010-08-09 248-579-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C FARMINGTON MI
2010-04-23 248-905-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C SOUTHFIELD MI
2006-06-22 248-677-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C ROYAL OAK MI
2006-06-08 248-732-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C PONTIAC MI
2006-05-15 248-896-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C WALLEDLAKE MI
2006-02-06 248-200-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C SOUTHFIELD MI
2006-02-06 248-432-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C W BLOOMFLD MI
2006-02-06 248-572-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C OXFORD MI
2006-02-06 248-573-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C SOUTH LYON MI
2006-02-06 248-599-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C DRAYTON PL MI
2006-02-06 248-608-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C ROCHESTER MI
2006-02-06 248-719-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C NORTHVILLE MI
2006-02-06 248-729-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C TROY MI
2006-02-02 248-242-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C COMMERCE MI
2006-02-02 248-260-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C AUBURN HTS MI
2006-02-02 248-382-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C HOLLY MI
2006-02-02 248-707-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C CLARKSTON MI
2006-02-02 248-783-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C LAKE ORION MI
2006-02-02 248-792-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C BIRMINGHAM MI
2006-02-02 248-893-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C FARMINGTON 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.