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
2015-04-23 475-328-4XXX 4000–4999Assigned ONVOY, LLC - CT 639C DARIEN CT
2015-04-23 475-343-5XXX 5000–5999Assigned ONVOY, LLC - CT 639C MERIDEN CT
2015-04-23 475-619-3XXX 3000–3999Assigned ONVOY, LLC - CT 639C STAMFORD CT
2015-04-23 475-655-7XXX 7000–7999Assigned ONVOY, LLC - CT 639C NEW HAVEN CT
2015-04-23 475-675-1XXX 1000–1999Assigned ONVOY, LLC - CT 639C SEYMOUR CT
2015-04-23 475-689-2XXX 2000–2999Assigned ONVOY, LLC - CT 639C WATERBURY CT
2015-04-23 475-888-0XXX 0000–0999Assigned ONVOY, LLC - CT 639C FAIRFIELD CT
2015-04-23 475-988-0XXX 0000–0999Assigned ONVOY, LLC - CT 639C BRIDGEPORT CT
2015-04-17 475-212-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NAUGATUCK CT
2015-04-17 475-212-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NAUGATUCK CT
2015-04-17 475-219-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WOLCOTT CT
2015-04-17 475-343-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F MERIDEN CT
2015-04-17 475-343-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F MERIDEN CT
2015-04-15 475-325-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 GEORGETOWN CT
2015-04-15 475-655-1XXX 1000–1999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F NEW HAVEN CT
2015-04-13 475-208-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NORWALK CT
2015-04-13 475-208-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NORWALK CT
2015-04-13 475-208-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NORWALK CT
2015-04-13 475-208-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NORWALK CT
2015-04-13 475-221-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRANFORD CT
2015-04-13 475-221-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRANFORD CT
2015-04-13 475-221-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRANFORD CT
2015-04-13 475-223-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2015-04-13 475-289-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2015-04-13 475-299-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F STAMFORD CT
2015-04-13 475-299-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F STAMFORD CT
2015-04-13 475-328-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DARIEN CT
2015-04-13 475-328-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DARIEN CT
2015-04-13 475-329-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2015-04-13 475-329-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2015-04-13 475-355-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2015-04-13 475-422-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2015-04-13 475-441-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2015-04-13 475-441-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2015-04-13 475-441-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2015-04-13 475-441-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2015-04-13 475-441-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2015-04-13 475-441-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2015-04-13 475-619-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F STAMFORD CT
2015-04-13 475-655-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2015-04-13 475-689-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 WATERBURY CT
2015-04-01 475-777-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 ANSONIDRBY CT
2015-03-26 475-441-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2015-03-25 475-689-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. - CT 350E WATERBURY CT
2015-03-24 475-777-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J ANSONIDRBY CT
2015-03-11 475-240-0XXX 0000–0999Assigned TC SYSTEMS, INC. - NY 7140 GREENWICH CT
2015-03-11 475-240-1XXX 1000–1999Assigned TC SYSTEMS, INC. - NY 7140 GREENWICH CT
2015-03-11 475-240-2XXX 2000–2999Assigned TC SYSTEMS, INC. - NY 7140 GREENWICH CT
2015-03-11 475-240-3XXX 3000–3999Assigned TC SYSTEMS, INC. - NY 7140 GREENWICH CT
2015-03-11 475-240-4XXX 4000–4999Assigned TC SYSTEMS, INC. - NY 7140 GREENWICH 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.