NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

25 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 475
ONVOY, LLC - CT 17
BANDWIDTH.COM CLEC, LLC - CT 4
CSC WIRELESS, LLC 3
OMNIPOINT COMMUNICATIONS, INC. - CT 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
2014-12-01 475-434-9XXX 9000–9999Assigned METROPCS, INC. 5562 NEW HAVEN CT
2014-11-20 475-289-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2014-11-20 475-449-9XXX 9000–9999Assigned CSC VOICE, LLC 612K BRIDGEPORT CT
2014-11-17 475-215-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J RIDGEFIELD CT
2014-11-17 475-239-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F TRUMBULL CT
2014-11-17 475-239-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F TRUMBULL CT
2014-11-13 475-449-4XXX 4000–4999Assigned METROPCS, INC. 5562 BRIDGEPORT CT
2014-11-12 475-209-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2014-11-12 475-209-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2014-11-12 475-209-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2014-11-07 475-328-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DARIEN CT
2014-11-06 475-204-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2014-11-06 475-329-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2014-11-06 475-329-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2014-11-05 475-209-9XXX 9000–9999Assigned CSC VOICE, LLC 612K NEW HAVEN CT
2014-11-05 475-235-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 WATERBURY CT
2014-11-05 475-449-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT CT
2014-11-04 475-449-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2014-11-04 475-449-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2014-11-04 475-449-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2014-10-28 475-444-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NEWTOWN CT
2014-10-27 475-222-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WATERBURY CT
2014-10-27 475-222-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WATERBURY CT
2014-10-27 475-222-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WATERBURY CT
2014-10-24 475-204-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2014-10-14 475-355-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2014-10-14 475-355-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2014-10-08 475-777-7XXX 7000–7999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F ANSONIDRBY CT
2014-10-08 475-888-8XXX 8000–8999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F FAIRFIELD CT
2014-10-06 475-288-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NORWALK 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
2014-10-06 475-288-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NORWALK CT
2014-10-06 475-289-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J DANBURY CT
2014-09-26 475-209-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2014-09-26 475-209-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2014-09-26 475-289-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 DANBURY CT
2014-09-24 475-209-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NEW HAVEN CT
2014-09-22 475-355-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2014-09-22 475-444-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEWTOWN CT
2014-09-12 475-223-4XXX 4000–4999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 ANSONIDRBY CT
2014-09-12 475-223-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2014-09-12 475-223-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2014-09-11 475-328-5XXX 5000–5999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 DARIEN CT
2014-09-09 475-282-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT CT
2014-09-09 475-355-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2014-09-09 475-355-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN 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.