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 361
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
2023-06-02 361-567-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C BRUNI TX
2014-09-15 361-336-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C C CHRISTI TX
2014-02-21 361-371-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C C CHRISTI TX
2013-10-10 361-231-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C HEBBRONVL TX
2013-10-10 361-441-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C WOODSBORO TX
2013-02-01 361-287-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C SKIDMORE TX
2013-02-01 361-587-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SINTON TX
2012-11-12 361-867-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C PADRE IS TX
2012-01-13 361-256-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C BENAVIDES TX
2011-11-14 361-210-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CUERO TX
2011-10-28 361-209-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SAN DIEGO TX
2011-10-28 361-255-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C MATHIS TX
2011-10-28 361-308-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C EDNA TX
2011-10-28 361-349-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C REFUGIO TX
2011-10-28 361-394-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C FREER TX
2011-10-28 361-405-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C GOLIAD TX
2011-10-28 361-407-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C YOAKUM TX
2011-10-28 361-579-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C VICTORIA TX
2011-10-28 361-594-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SHINER TX
2011-10-28 361-596-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C MOULTON TX
2011-10-28 361-865-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C FLATONIA TX
2011-09-12 361-233-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C NORDHEIM TX
2011-08-05 361-929-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C C CHRISTI TX
2011-07-21 361-431-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C FLOURBLUFF TX
2011-05-24 361-350-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C BEEVILLE TX
2011-05-24 361-450-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ROCKPORT TX
2011-05-24 361-491-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C YORKTOWN TX
2011-05-24 361-595-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C KINGSVILLE TX
2009-12-03 361-453-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C ALICE TX
2009-10-16 361-265-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C CLARKWOOD TX
2009-10-16 361-317-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CALALLEN TX
2008-12-17 361-462-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C C CHRISTI TX
2008-10-27 361-454-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C BAYSIDE TX
2004-10-29 361-733-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C HALLETTSVL TX

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.