NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

5 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 203
ONVOY, LLC - CT 5
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
2010-07-16 203-883-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 STAMFORD CT
2010-07-16 203-883-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 STAMFORD CT
2010-07-14 203-693-6XXX 6000–6999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 MILFORD CT
2010-07-13 203-601-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F TRUMBULL CT
2010-07-12 203-308-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J ANSONIDRBY CT
2010-07-09 203-302-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F GREENWICH CT
2010-07-09 203-308-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2010-07-09 203-309-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DARIEN CT
2010-07-09 203-501-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2010-07-09 203-584-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2010-07-09 203-660-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BYRAM CT
2010-07-06 203-585-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2010-07-06 203-694-9XXX 9000–9999Assigned METROPCS, INC. 5562 MERIDEN CT
2010-07-06 203-725-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 WATERBURY CT
2010-07-06 203-738-8XXX 8000–8999Assigned METROPCS, INC. 5562 GUILFORD CT
2010-07-06 203-935-1XXX 1000–1999Assigned METROPCS, INC. 5562 MERIDEN CT
2010-07-02 203-807-7XXX 7000–7999Assigned METROPCS, INC. 5562 NORWALK CT
2010-07-01 203-819-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WATERBURY CT
2010-07-01 203-916-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 BRIDGEPORT CT
2010-06-24 203-917-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DANBURY CT
2010-06-23 203-212-3XXX 3000–3999Assigned CSC VOICE, LLC 612K BRIDGEPORT CT
2010-06-23 203-406-7XXX 7000–7999Assigned CSC VOICE, LLC 612K STAMFORD CT
2010-06-23 203-769-1XXX 1000–1999Assigned CSC VOICE, LLC 612K GREENWICH CT
2010-06-18 203-546-7XXX 7000–7999Assigned CHARTER IP ENABLED SERVICES, LLC 792K DANBURY CT
2010-06-11 203-738-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J GUILFORD CT
2010-06-11 203-893-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2010-06-04 203-212-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2010-06-04 203-212-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2010-06-04 203-244-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F RIDGEFIELD CT
2010-06-04 203-286-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NORWALK CT
2010-06-04 203-296-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2010-06-04 203-344-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F OLDGRNWICH CT
2010-06-04 203-350-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F MADISON CT
2010-06-04 203-405-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WOODBURY CT
2010-06-04 203-491-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEWTOWN CT
2010-06-04 203-541-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F STAMFORD CT
2010-06-04 203-604-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2010-06-04 203-701-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F MILFORD CT
2010-06-04 203-721-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WATERBURY CT
2010-06-04 203-747-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2010-06-04 203-772-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2010-06-04 203-787-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2010-06-04 203-868-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2010-06-04 203-885-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2010-06-04 203-917-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2010-06-02 203-212-2XXX 2000–2999Assigned METROPCS, INC. 5562 BRIDGEPORT CT
2010-06-02 203-360-7XXX 7000–7999Assigned METROPCS, INC. 5562 BRIDGEPORT CT
2010-06-02 203-360-8XXX 8000–8999Assigned METROPCS, INC. 5562 BRIDGEPORT CT
2010-05-26 203-242-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HUNTINGTON CT
2010-05-26 203-446-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY 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.