NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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 301
LEVEL 3 COMMUNICATIONS, LLC - MD 111
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
2019-04-30 301-664-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN2 MD
2016-09-26 301-786-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 MCCOOLE MD
2016-09-22 301-223-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WILLIAMSPT MD
2016-03-23 301-745-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 HAGERSTOWN MD
2016-02-03 301-273-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2014-09-29 301-407-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GAITHERSBG MD
2014-09-29 301-754-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2014-09-10 301-850-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNG236Z14 MD
2014-06-10 301-994-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 LXTNPKGRML MD
2014-05-28 301-844-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2014-03-26 301-761-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNGTNZN11 MD
2014-01-28 301-761-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNGTNZN11 MD
2014-01-07 301-798-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 DAMASCS240 MD
2012-10-10 301-798-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 DAMASCS240 MD
2012-03-28 301-200-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 INDIANHEAD MD
2012-03-28 301-850-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNG236Z14 MD
2011-12-21 301-605-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNGTNZN10 MD
2011-10-05 301-363-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 DAMASCS240 MD
2011-09-16 301-557-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2011-09-16 301-557-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2011-09-16 301-557-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2011-09-16 301-557-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2011-09-16 301-557-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2011-09-16 301-557-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2011-09-16 301-557-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2011-09-16 301-557-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2011-02-18 301-684-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 INDIANHEAD MD
2011-01-03 301-355-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GAITHERSBG MD
2009-11-02 301-355-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GAITHERSBG MD
2009-09-30 301-355-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GAITHERSBG MD
2009-09-29 301-715-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNG236Z15 MD
2008-11-14 301-363-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 DAMASCS240 MD
2008-05-06 301-234-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNGTNZN16 MD
2008-03-03 301-298-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNG236Z15 MD
2008-02-01 301-533-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 OAKLAND MD
2008-01-23 301-850-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNG236Z14 MD
2008-01-22 301-862-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 LXTNPKGRML MD
2007-11-21 301-917-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNGTNZN10 MD
2007-11-20 301-563-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2007-11-20 301-710-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WALDORF MD
2007-11-06 301-256-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 LAUREL236 MD
2007-10-26 301-328-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2007-10-16 301-710-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WALDORF MD
2007-10-16 301-755-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2007-10-05 301-710-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WALDORF MD
2007-08-01 301-830-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2007-07-17 301-841-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN2 MD
2007-06-21 301-760-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN2 MD
2007-06-21 301-841-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN2 MD
2007-03-28 301-965-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN6 MD

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.