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 475
LEVEL 3 COMMUNICATIONS, LLC - CT 30
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
2025-01-07 475-384-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NEW HAVEN CT
2024-12-26 475-357-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 MILFORD CT
2024-10-11 475-369-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 HUNTINGTON CT
2024-05-07 475-365-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NEW HAVEN CT
2020-08-13 475-273-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 BRIDGEPORT CT
2020-07-22 475-262-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 HUNTINGTON CT
2020-04-24 475-262-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 HUNTINGTON CT
2020-04-24 475-262-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 HUNTINGTON CT
2020-03-17 475-262-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 HUNTINGTON CT
2020-01-17 475-400-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 STAMFORD CT
2019-12-20 475-477-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 STAMFORD CT
2019-10-03 475-216-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 ANSONIDRBY CT
2019-09-18 475-473-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 WOODBURY CT
2019-07-19 475-216-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 ANSONIDRBY CT
2019-06-03 475-685-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 STAMFORD CT
2016-07-26 475-232-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 STAMFORD CT
2015-09-02 475-897-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 GREENWICH CT
2015-07-24 475-209-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NEW HAVEN CT
2015-07-24 475-266-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NORWALK CT
2014-12-09 475-208-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NORWALK CT
2014-10-28 475-444-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NEWTOWN CT
2014-10-06 475-288-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NORWALK CT
2014-10-06 475-288-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NORWALK CT
2014-10-06 475-288-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NORWALK CT
2014-10-06 475-288-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NORWALK CT
2014-10-06 475-288-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NORWALK CT
2014-09-24 475-209-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NEW HAVEN CT
2012-11-07 475-235-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 WATERBURY CT
2012-07-05 475-529-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 DANBURY CT
2011-11-28 475-282-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 BRIDGEPORT CT

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.