NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

22 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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 14
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
2020-01-25 475-477-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F STAMFORD CT
2020-01-25 475-477-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F STAMFORD CT
2020-01-25 475-477-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F STAMFORD CT
2020-01-25 475-558-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW CANAAN CT
2020-01-17 475-237-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DANBURY CT
2020-01-17 475-400-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 STAMFORD CT
2020-01-08 475-263-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WATERBURY CT
2020-01-02 475-258-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NORWALK CT
2019-12-23 475-231-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F TRUMBULL CT
2019-12-23 475-231-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F TRUMBULL CT
2019-12-20 475-477-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 STAMFORD CT
2019-12-18 475-477-4XXX 4000–4999Assigned ONVOY, LLC - CT 639C STAMFORD CT
2019-12-18 475-477-5XXX 5000–5999Assigned ONVOY, LLC - CT 639C STAMFORD CT
2019-12-18 475-477-6XXX 6000–6999Assigned ONVOY, LLC - CT 639C STAMFORD CT
2019-12-18 475-477-7XXX 7000–7999Assigned ONVOY, LLC - CT 639C STAMFORD CT
2019-12-16 475-216-4XXX 4000–4999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F ANSONIDRBY CT
2019-12-16 475-252-1XXX 1000–1999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F BYRAM CT
2019-12-16 475-900-2XXX 2000–2999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F GUILFORD CT
2019-12-10 475-259-4XXX 4000–4999Assigned CSC WIRELESS, LLC 425J DARIEN CT
2019-12-10 475-259-6XXX 6000–6999Assigned CSC WIRELESS, LLC 425J DARIEN CT
2019-12-04 475-256-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DANBURY CT
2019-12-04 475-261-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2019-11-29 475-359-4XXX 4000–4999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F STAMFORD CT
2019-11-18 475-215-4XXX 4000–4999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F RIDGEFIELD CT
2019-10-17 475-900-1XXX 1000–1999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F GUILFORD CT
2019-10-16 475-338-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRANFORD CT
2019-10-08 475-254-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2019-10-07 475-237-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DANBURY CT
2019-10-03 475-216-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 ANSONIDRBY CT
2019-10-03 475-263-9XXX 9000–9999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F WATERBURY CT
2019-10-01 475-252-0XXX 0000–0999Assigned TELNYX LLC 073H BYRAM CT
2019-09-18 475-473-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 WOODBURY CT
2019-09-13 475-257-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2019-09-13 475-257-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2019-09-13 475-258-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NORWALK CT
2019-09-10 475-236-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2019-09-10 475-241-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2019-09-10 475-254-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2019-09-10 475-256-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 DANBURY CT
2019-09-10 475-888-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 FAIRFIELD CT
2019-08-23 475-522-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J MADISON CT
2019-08-19 475-254-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2019-08-19 475-254-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2019-08-19 475-254-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2019-07-31 475-207-5XXX 5000–5999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F WOODBURY CT
2019-07-31 475-257-3XXX 3000–3999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F NORWALK CT
2019-07-31 475-500-1XXX 1000–1999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F GREENWICH CT
2019-07-30 475-338-2XXX 2000–2999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F BRANFORD CT
2019-07-30 475-900-0XXX 0000–0999Assigned TELNYX LLC 073H GUILFORD CT
2019-07-29 475-685-4XXX 4000–4999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F STAMFORD CT

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.