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
2021-09-09 475-287-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2021-09-09 475-309-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2021-09-09 475-309-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2021-09-09 475-309-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2021-09-09 475-455-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2021-09-09 475-455-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2021-09-02 475-305-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WATERBURY CT
2021-09-02 475-305-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WATERBURY CT
2021-09-02 475-305-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WATERBURY CT
2021-09-02 475-305-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WATERBURY CT
2021-09-02 475-305-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WATERBURY CT
2021-09-02 475-675-4XXX 4000–4999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F SEYMOUR CT
2021-08-31 475-290-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2021-08-31 475-290-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2021-08-31 475-290-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2021-08-31 475-290-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2021-08-30 475-348-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2021-08-25 475-755-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NORWALK CT
2021-08-23 475-281-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 ANSONIDRBY CT
2021-08-12 475-305-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 WATERBURY CT
2021-08-10 475-261-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2021-08-10 475-273-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2021-08-10 475-273-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2021-08-10 475-273-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2021-08-10 475-287-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2021-08-10 475-287-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2021-08-10 475-287-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2021-08-10 475-295-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 WATERBURY CT
2021-08-10 475-295-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 WATERBURY CT
2021-08-10 475-312-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2021-08-10 475-345-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2021-08-10 475-345-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2021-08-10 475-345-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2021-08-10 475-345-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2021-08-10 475-345-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2021-08-10 475-766-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2021-08-02 475-276-0XXX 0000–0999Assigned COMMIO, LLC 939H STAMFORD CT
2021-08-02 475-276-1XXX 1000–1999Assigned COMMIO, LLC 939H STAMFORD CT
2021-08-02 475-276-2XXX 2000–2999Assigned COMMIO, LLC 939H STAMFORD CT
2021-08-02 475-276-3XXX 3000–3999Assigned COMMIO, LLC 939H STAMFORD CT
2021-08-02 475-276-8XXX 8000–8999Assigned COMMIO, LLC 939H STAMFORD CT
2021-07-29 475-293-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WALLINGFD CT
2021-07-29 475-293-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WALLINGFD CT
2021-07-28 475-295-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WATERBURY CT
2021-07-28 475-295-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WATERBURY CT
2021-07-28 475-295-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WATERBURY CT
2021-07-28 475-295-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WATERBURY CT
2021-07-28 475-295-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WATERBURY CT
2021-07-22 475-294-4XXX 4000–4999Assigned ONVOY, LLC - CT 639C MILFORD CT
2021-07-22 475-294-5XXX 5000–5999Assigned ONVOY, LLC - CT 639C MILFORD 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.