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 336
AT&T ENTERPRISES, LLC 19
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
2016-05-26 336-690-0XXX 0000–0999Assigned AT&T ENTERPRISES, LLC 516C GREENSBORO NC
2016-05-17 336-930-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C WINSTN SAL NC
2016-03-03 336-585-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C BURLINGTON NC
2014-12-08 336-897-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C GREENSBORO NC
2014-10-08 336-661-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C WINSTN SAL NC
2014-03-21 336-265-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C GREENSBORO NC
2013-09-11 336-893-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C WINSTN SAL NC
2013-01-03 336-541-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C GREENSBORO NC
2011-10-11 336-891-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C RUFFIN NC
2011-05-09 336-892-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C JULIAN NC
2011-02-23 336-738-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C ANDERSON NC
2010-03-30 336-295-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C MONTICELLO NC
2010-03-30 336-370-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C GREENSBORO NC
2010-03-30 336-441-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C SUMMERFLD NC
2010-03-30 336-505-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C KIMESVILLE NC
2010-03-30 336-524-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C BURLINGTON NC
2010-03-30 336-525-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C SAXAPAHAW NC
2010-03-30 336-637-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C REIDSVILLE NC
2010-02-18 336-546-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C WINSTN SAL NC

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.