NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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 870
AT&T ENTERPRISES, LLC 72
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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2024-07-18 870-264-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C OIL TROUGH AR
2015-03-06 870-559-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C MARION AR
2013-01-23 870-748-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CALION AR
2012-11-08 870-271-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C HARRISBURG AR
2012-11-08 870-639-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C EL DORADO AR
2011-11-15 870-667-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C ASHDOWN AR
2011-10-12 870-455-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C NASHVILLE AR
2011-10-12 870-474-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C HOPE AR
2011-10-12 870-576-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C OSCEOLA AR
2011-10-12 870-759-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C WALNUT RDG AR
2011-10-12 870-821-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C MARIANNA AR
2011-08-01 870-355-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C EUDORA AR
2011-08-01 870-466-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C WARREN AR
2011-08-01 870-533-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C STAMPS AR
2011-08-01 870-590-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SMACKOVER AR
2011-08-01 870-831-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C HAMBURG AR
2011-05-09 870-587-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C WYNNE AR
2011-05-09 870-626-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C MAGNOLIA AR
2011-03-30 870-262-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C BATESVILLE AR
2011-03-30 870-283-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C CAVE CITY AR
2011-03-30 870-442-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C CHERRY VLY AR
2011-03-30 870-477-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C CASH AR
2011-03-30 870-589-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C BRINKLEY AR
2011-03-30 870-657-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C BLACKFIHLK AR
2011-03-30 870-668-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C CONCORD AR
2011-03-30 870-823-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C CRAWFODSVL AR
2011-03-30 870-838-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C BLYTHEVL AR
2011-03-30 870-878-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C BLACK ROCK AR
2011-03-30 870-899-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C BODCAW AR
2011-03-23 870-742-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C STRONG AR
2011-03-21 870-203-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C JONESBORO AR
2011-03-21 870-217-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C NEWPORT AR
2011-03-21 870-252-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C GRUBBS AR
2011-03-21 870-339-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C HUGHES AR
2011-03-21 870-343-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C TURRELL AR
2011-03-21 870-493-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C DELL AR
2011-03-21 870-537-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C JOINER AR
2011-03-21 870-573-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C PARAGOULD AR
2011-03-21 870-629-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C W MEMPHIS AR
2011-03-21 870-630-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C FORREST CY AR
2011-03-21 870-655-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C WILSON AR
2011-03-21 870-658-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C LUXORA AR
2011-03-21 870-697-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C HICKORYRDG AR
2011-03-21 870-744-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C TUPELO AR
2011-03-21 870-753-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C HELENA AR
2011-03-21 870-755-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C PARKIN AR
2011-03-21 870-768-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C MORO AR
2011-03-21 870-792-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C EARLE AR
2011-03-21 870-799-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C NEWARK AR
2011-03-01 870-224-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C MONTICELLO AR

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.