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
2025-08-01 475-370-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2025-07-29 475-394-9XXX 9000–9999Assigned AT&T - LOCAL 7421 ANSONIDRBY CT
2025-07-16 475-200-8XXX 8000–8999Assigned HD CARRIER LLC 321J HUNTINGTON CT
2025-07-16 475-260-2XXX 2000–2999Assigned HD CARRIER LLC 321J HUNTINGTON CT
2025-07-16 475-369-7XXX 7000–7999Assigned HD CARRIER LLC 321J HUNTINGTON CT
2025-07-15 475-374-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2025-06-26 475-391-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT CT
2025-06-09 475-389-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 WATERBURY CT
2025-06-06 475-374-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 ANSONIDRBY CT
2025-05-20 475-274-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 GUILFORD CT
2025-05-20 475-361-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 CHESHIRE CT
2025-05-20 475-362-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 SEYMOUR CT
2025-05-20 475-363-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 WESTPORT CT
2025-05-20 475-364-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 WOODBURY CT
2025-05-20 475-374-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2025-05-20 475-383-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS, INC. - NY 6622 GREENWICH CT
2025-04-24 475-347-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MERIDEN CT
2025-04-16 475-381-8XXX 8000–8999Assigned ONVOY, LLC - CT 639C WALLINGFD CT
2025-04-16 475-388-1XXX 1000–1999Assigned ONVOY, LLC - CT 639C STAMFORD CT
2025-04-16 475-389-0XXX 0000–0999Assigned ONVOY, LLC - CT 639C WATERBURY CT
2025-04-16 475-392-0XXX 0000–0999Assigned ONVOY, LLC - CT 639C NEW HAVEN CT
2025-04-14 475-363-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WESTPORT CT
2025-04-14 475-364-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WOODBURY CT
2025-04-08 475-264-5XXX 5000–5999Assigned ONVOY, LLC - CT 639C DARIEN CT
2025-04-08 475-353-6XXX 6000–6999Assigned ONVOY, LLC - CT 639C FAIRFIELD CT
2025-04-08 475-353-7XXX 7000–7999Assigned ONVOY, LLC - CT 639C FAIRFIELD CT
2025-04-08 475-361-9XXX 9000–9999Assigned ONVOY, LLC - CT 639C CHESHIRE CT
2025-04-08 475-391-0XXX 0000–0999Assigned ONVOY, LLC - CT 639C BRIDGEPORT CT
2025-04-04 475-387-0XXX 0000–0999Assigned NUSO, LLC 732J NEW HAVEN CT
2025-04-04 475-387-6XXX 6000–6999Assigned NUSO, LLC 732J NEW HAVEN CT
2025-04-02 475-368-6XXX 6000–6999Assigned CSC WIRELESS, LLC 425J DARIEN CT
2025-04-02 475-368-7XXX 7000–7999Assigned CSC WIRELESS, LLC 425J DARIEN CT
2025-04-02 475-368-9XXX 9000–9999Assigned CSC WIRELESS, LLC 425J DARIEN CT
2025-04-01 475-387-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2025-03-26 475-390-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2025-03-26 475-390-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2025-03-26 475-390-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2025-03-26 475-390-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2025-03-26 475-390-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2025-03-26 475-390-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2025-03-26 475-390-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2025-03-26 475-390-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2025-03-26 475-390-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2025-03-26 475-390-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2025-03-20 475-347-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MERIDEN CT
2025-03-20 475-347-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MERIDEN CT
2025-03-13 475-357-8XXX 8000–8999Assigned ONVOY, LLC - CT 639C MILFORD CT
2025-03-13 475-367-2XXX 2000–2999Assigned ONVOY, LLC - CT 639C BYRAM CT
2025-03-13 475-383-1XXX 1000–1999Assigned ONVOY, LLC - CT 639C GREENWICH CT
2025-03-11 475-472-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 WILTON 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.