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 616
AT&T ENTERPRISES, LLC 35
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
2016-05-09 616-649-0XXX 0000–0999Assigned AT&T ENTERPRISES, LLC 516C GRAND RPDS MI
2014-09-12 616-202-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C GRAND RPDS MI
2014-05-13 616-253-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C MOLINE MI
2014-04-07 616-288-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C GRAND RPDS MI
2013-10-10 616-537-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C LAKEODESSA MI
2013-01-28 616-677-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C MARNE MI
2012-11-14 616-383-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C SPARTA MI
2012-11-07 616-232-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C GREENVILLE MI
2012-11-07 616-439-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CEDAR SPG MI
2011-12-01 616-524-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C GRATTAN MI
2011-08-11 616-420-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ALTO MI
2011-08-11 616-557-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SAND LAKE MI
2011-08-11 616-675-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C CASNOVIA MI
2011-08-11 616-765-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C FREEPORT MI
2011-08-11 616-841-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C IONIA MI
2011-08-11 616-952-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C KENT CITY MI
2011-08-11 616-984-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C TRUFANT MI
2011-02-10 616-427-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C GRAND RPDS MI
2011-01-19 616-244-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C BELDING MI
2011-01-19 616-378-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C JAMESTOWN MI
2011-01-19 616-504-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CLARKSVL MI
2011-01-19 616-577-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C SARANAC MI
2011-01-19 616-681-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C DORR MI
2010-03-04 616-258-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C GRAND RPDS MI
2009-01-13 616-805-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C GRAND RPDS MI
2006-11-14 616-884-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C ROCKFORD MI
2006-11-07 616-682-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C ADA MI
2006-11-07 616-987-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C LOWELL MI
2006-11-03 616-277-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C BYRON CTR MI
2006-11-03 616-536-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C CALEDONIA MI
2006-06-12 616-797-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C HUDSONVL MI
2006-03-10 616-607-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C GRANDHAVEN MI
2006-03-10 616-848-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C HOLLAND MI
2006-03-09 616-541-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C DUTTON MI
2005-12-12 616-931-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C ZEELAND 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.