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
2014-07-22 475-209-4XXX 4000–4999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 NEW HAVEN CT
2014-07-17 475-289-9XXX 9000–9999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 DANBURY CT
2014-07-11 475-223-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2014-07-10 475-355-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2014-07-10 475-355-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2014-06-27 475-215-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J RIDGEFIELD CT
2014-06-17 475-277-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WILTON CT
2014-06-12 475-223-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ANSONIDRBY CT
2014-06-12 475-239-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J TRUMBULL CT
2014-06-12 475-328-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DARIEN CT
2014-06-12 475-444-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J NEWTOWN CT
2014-06-12 475-675-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SEYMOUR CT
2014-06-12 475-999-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FAIRFIELD CT
2014-06-10 475-204-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DANBURY CT
2014-06-06 475-223-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 ANSONIDRBY CT
2014-06-03 475-227-8XXX 8000–8999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 NEW HAVEN CT
2014-06-02 475-223-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F ANSONIDRBY CT
2014-06-02 475-223-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F ANSONIDRBY CT
2014-05-27 475-223-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2014-05-27 475-999-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F FAIRFIELD CT
2014-05-27 475-999-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F FAIRFIELD CT
2014-05-23 475-289-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2014-05-23 475-289-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2014-05-23 475-355-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2014-05-23 475-355-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2014-05-21 475-243-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2014-05-21 475-444-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEWTOWN CT
2014-05-01 475-328-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2014-04-24 475-329-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J DANBURY CT
2014-04-17 475-243-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2014-04-17 475-243-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2014-04-16 475-329-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 DANBURY CT
2014-04-10 475-529-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2014-04-09 475-235-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 WATERBURY CT
2014-03-26 475-329-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2014-03-26 475-329-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2014-03-20 475-204-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2014-03-20 475-205-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2014-03-20 475-205-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2014-03-20 475-205-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2014-03-20 475-882-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F HUNTINGTON CT
2014-03-20 475-882-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F HUNTINGTON CT
2014-03-20 475-999-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F FAIRFIELD CT
2014-03-13 475-227-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2014-03-12 475-202-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2014-03-12 475-202-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2014-03-05 475-675-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J SEYMOUR CT
2014-02-28 475-444-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEWTOWN CT
2014-01-09 475-212-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NAUGATUCK CT
2013-11-15 475-999-3XXX 3000–3999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 FAIRFIELD 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.