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 573
AT&T ENTERPRISES, LLC 81
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
2025-09-15 573-422-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C VIENNA MO
2025-09-15 573-455-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C WESTPHALIA MO
2025-09-15 573-799-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C LINN MO
2025-09-15 573-972-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C META MO
2024-08-13 573-965-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C VERSAILLES MO
2024-07-19 573-720-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C BLYTHEVL MO
2013-10-14 573-372-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C GRAVOIS ML MO
2013-10-14 573-564-0XXX 0000–0999Assigned AT&T ENTERPRISES, LLC 516C MONTGORYCY MO
2012-11-06 573-264-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SCOTT CITY MO
2012-11-06 573-370-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C GIDEON MO
2012-11-06 573-391-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C PORTAGEVL MO
2012-11-06 573-416-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C FULTON MO
2012-11-06 573-684-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C WELLSVILLE MO
2012-11-06 573-846-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C PERRYVILLE MO
2012-11-06 573-887-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C CHAFFEE MO
2012-01-12 573-276-0XXX 0000–0999Assigned AT&T ENTERPRISES, LLC 516C MALDEN MO
2011-09-22 573-246-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CAMPBELL MO
2011-09-22 573-262-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ORAN MO
2011-09-22 573-427-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C CHARLESTON MO
2011-09-22 573-440-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C FREDERCKTN MO
2011-09-22 573-557-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C ELDON MO
2011-09-22 573-568-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C BLOOMFIELD MO
2011-09-22 573-621-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SIKESTON MO
2011-09-22 573-643-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C MARSTON MO
2011-09-22 573-649-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C E PRAIRIE MO
2011-09-22 573-654-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C CARDWELL MO
2011-09-22 573-688-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C LILBOURN MO
2011-09-22 573-722-0XXX 0000–0999Assigned AT&T ENTERPRISES, LLC 516C ADVANCE MO
2011-09-22 573-738-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SENATH MO
2011-09-22 573-741-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C MARBLEHILL MO
2011-09-22 573-748-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C NEW MADRID MO
2011-09-22 573-755-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C JACKSON MO
2011-09-22 573-833-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C POCAHONTAS MO
2011-09-22 573-919-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C KENNETT MO
2011-09-22 573-964-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C LKOZKOSBCH MO
2011-05-20 573-788-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C OLDAPPLETN MO
2011-04-29 573-534-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C BONNETERRE MO
2011-04-28 573-484-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C BEAUFORT MO
2011-04-21 573-213-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C BOWLNGGREN MO
2011-04-21 573-240-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CENTER MO
2011-04-21 573-250-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CLARKSVL MO
2011-04-21 573-260-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C CLIMAX SPG MO
2011-04-21 573-266-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C OAK RIDGE MO
2011-04-21 573-283-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C ESSEX MO
2011-04-21 573-290-0XXX 0000–0999Assigned AT&T ENTERPRISES, LLC 516C CAPEGIRARD MO
2011-04-21 573-309-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C BELL CITY MO
2011-04-21 573-312-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ELSBERRY MO
2011-04-21 573-327-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C FLAT RIVER MO
2011-04-21 573-328-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C QULIN MO
2011-04-21 573-343-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C PUXICO MO

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.