NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 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, last 30 days — NPA 443
LEVEL 3 COMMUNICATIONS, LLC - MD 1
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
2026-08-25 443-329-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WATERLO236 MD
2020-06-16 443-318-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 COCKEYSVL MD
2018-08-29 443-269-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2018-04-20 443-437-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 POCOMOKE MD
2017-11-16 443-836-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2017-11-16 443-836-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2017-07-27 443-978-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SALISBURY MD
2016-09-22 443-439-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TRAPPE MD
2016-09-22 443-441-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GLENWOOD MD
2016-09-22 443-448-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 DENTON MD
2016-06-28 443-652-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2014-09-29 443-210-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SALISBURY MD
2014-09-29 443-746-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 EASTON MD
2014-06-16 443-809-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2014-06-16 443-809-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2014-06-16 443-809-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2014-06-16 443-809-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2014-06-16 443-809-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2014-06-16 443-809-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2014-06-16 443-809-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2014-06-16 443-809-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2014-06-16 443-809-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2014-06-16 443-809-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2014-01-20 443-566-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CHESAPKECY MD
2013-12-31 443-221-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ANNAPOLIS MD
2013-08-23 443-205-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CAMBRIDGE MD
2013-06-27 443-736-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SALISBURY MD
2013-06-27 443-832-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 COLUMBIA MD
2013-02-21 443-856-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 OCEAN CITY MD
2012-12-26 443-275-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2012-11-29 443-267-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 DARLINGTON MD
2012-11-07 443-620-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WATERLO238 MD
2012-08-03 443-262-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CENTREVL MD
2012-07-05 443-450-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 PIKESVILLE MD
2012-05-31 443-666-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CHESTERTN MD
2012-05-02 443-233-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 VIENNA MD
2012-02-15 443-219-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 PARKVILLE MD
2012-02-03 443-201-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WESTMINSTR MD
2012-02-03 443-991-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2012-01-31 443-892-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 NEWWINDSOR MD
2012-01-31 443-918-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TANEYTOWN MD
2011-12-21 443-760-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ABERDEEN MD
2011-12-01 443-505-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ESSEX MD
2011-10-27 443-218-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WORTHINGTN MD
2011-10-12 443-333-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ANNAPOLIS MD
2011-10-12 443-406-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ELKTON MD
2011-10-12 443-898-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 PIKESVILLE MD
2011-05-13 443-842-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2011-03-23 443-736-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SALISBURY MD
2011-03-10 443-367-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 COLUMBIA MD

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.