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
2011-12-01 475-529-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2011-11-28 475-282-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 BRIDGEPORT CT
2011-11-28 475-529-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2011-11-04 475-298-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRIDGEPORT CT
2011-11-04 475-298-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRIDGEPORT CT
2011-11-04 475-298-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRIDGEPORT CT
2011-11-04 475-298-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRIDGEPORT CT
2011-11-04 475-298-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRIDGEPORT CT
2011-09-30 475-201-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - CT 350E NEW HAVEN CT
2011-09-30 475-529-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DANBURY CT
2011-09-30 475-529-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DANBURY CT
2011-09-30 475-529-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DANBURY CT
2011-09-19 475-298-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT CT
2011-09-16 475-201-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2011-09-14 475-282-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2011-08-30 475-282-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2011-08-19 475-238-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2011-07-22 475-201-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2011-07-11 475-201-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2011-07-06 475-235-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WATERBURY CT
2011-06-27 475-227-2XXX 2000–2999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 NEW HAVEN CT
2011-06-14 475-227-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2011-06-14 475-227-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2011-06-14 475-227-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2011-06-14 475-227-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2011-06-14 475-227-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2011-06-06 475-202-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2011-05-23 475-202-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J NEW HAVEN CT
2011-05-23 475-202-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J NEW HAVEN CT
2011-04-20 475-202-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2011-04-20 475-202-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2011-04-20 475-202-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2010-12-03 475-238-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2010-10-01 475-238-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2010-05-13 475-201-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2010-05-13 475-201-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2010-05-13 475-201-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2009-08-13 475-882-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J HUNTINGTON 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.