NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

22 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 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
2016-06-21 475-897-0XXX 0000–0999Assigned BARR TEL USA, INC. - CT 866H GREENWICH CT
2016-06-20 475-275-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BYRAM CT
2016-06-20 475-465-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F OLDGRNWICH CT
2016-06-17 475-224-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2016-06-14 475-210-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2016-06-14 475-414-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2016-06-13 475-228-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F ANSONIDRBY CT
2016-06-13 475-313-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 WATERBURY CT
2016-06-13 475-470-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NORWALK CT
2016-06-13 475-666-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WESTPORT CT
2016-06-13 475-775-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 MERIDEN CT
2016-06-06 475-300-0XXX 0000–0999Assigned VONAGE AMERICA LLC 197D NEW HAVEN CT
2016-05-20 475-225-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT CT
2016-05-19 475-313-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J WATERBURY CT
2016-05-18 475-214-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2016-05-18 475-214-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2016-05-10 475-470-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NORWALK CT
2016-04-28 475-449-2XXX 2000–2999Assigned METROPCS, INC. 5562 BRIDGEPORT CT
2016-04-27 475-322-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2016-04-26 475-214-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2016-04-26 475-225-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT CT
2016-04-26 475-313-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 WATERBURY CT
2016-04-26 475-322-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2016-04-25 475-214-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2016-04-25 475-214-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2016-04-25 475-214-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2016-04-25 475-331-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2016-04-22 475-666-6XXX 6000–6999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F WESTPORT CT
2016-04-22 475-775-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 MERIDEN CT
2016-04-22 475-775-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 MERIDEN CT
2016-04-20 475-213-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2016-04-20 475-226-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2016-04-20 475-226-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2016-04-20 475-226-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2016-04-07 475-224-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2016-04-07 475-224-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2016-04-07 475-439-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2016-04-07 475-439-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2016-04-05 475-245-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2016-04-04 475-245-6XXX 6000–6999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 NORWALK CT
2016-04-04 475-331-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2016-04-04 475-331-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2016-03-31 475-210-3XXX 3000–3999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 BRIDGEPORT CT
2016-03-31 475-210-4XXX 4000–4999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 BRIDGEPORT CT
2016-03-31 475-210-5XXX 5000–5999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 BRIDGEPORT CT
2016-03-31 475-210-6XXX 6000–6999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 BRIDGEPORT CT
2016-03-31 475-210-7XXX 7000–7999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 BRIDGEPORT CT
2016-03-29 475-239-5XXX 5000–5999Assigned ONVOY, LLC - CT 639C TRUMBULL CT
2016-03-25 475-275-0XXX 0000–0999Assigned ONVOY, LLC - CT 639C BYRAM CT
2016-03-23 475-225-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT 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.