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
2017-12-06 475-400-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2017-12-06 475-400-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2017-12-06 475-400-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2017-12-06 475-400-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2017-12-06 475-400-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2017-12-06 475-400-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2017-12-05 475-338-8XXX 8000–8999Assigned ONVOY, LLC - CT 639C BRANFORD CT
2017-12-04 475-232-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2017-12-04 475-393-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2017-12-04 475-393-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2017-12-04 475-393-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2017-12-04 475-393-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2017-12-04 475-393-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2017-12-04 475-393-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2017-11-24 475-275-2XXX 2000–2999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F BYRAM CT
2017-11-22 475-400-0XXX 0000–0999Assigned ONVOY, LLC - CT 639C STAMFORD CT
2017-11-16 475-234-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2017-11-16 475-393-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NORWALK CT
2017-11-10 475-331-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2017-11-10 475-414-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2017-11-10 475-414-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2017-11-09 475-259-0XXX 0000–0999Assigned ONVOY, LLC - CT 639C DARIEN CT
2017-11-09 475-279-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2017-11-01 475-233-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 WATERBURY CT
2017-10-26 475-232-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2017-10-26 475-333-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2017-10-26 475-333-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2017-10-26 475-333-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2017-10-26 475-333-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2017-10-26 475-333-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2017-10-09 475-300-5XXX 5000–5999Assigned METROPCS, INC. 5562 NEW HAVEN CT
2017-10-04 475-775-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J MERIDEN CT
2017-10-03 475-233-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J WATERBURY CT
2017-10-02 475-224-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2017-09-29 475-800-0XXX 0000–0999Assigned ONVOY, LLC - CT 639C NEW HAVEN CT
2017-09-29 475-800-8XXX 8000–8999Assigned ONVOY, LLC - CT 639C NEW HAVEN CT
2017-09-26 475-233-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J WATERBURY CT
2017-09-26 475-259-9XXX 9000–9999Assigned METROPCS, INC. 5562 DARIEN CT
2017-09-26 475-279-2XXX 2000–2999Assigned METROPCS, INC. 5562 DANBURY CT
2017-09-22 475-323-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEWTOWN CT
2017-09-22 475-333-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 STAMFORD CT
2017-09-22 475-338-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J BRANFORD CT
2017-09-20 475-393-3XXX 3000–3999Assigned METROPCS, INC. 5562 NORWALK CT
2017-09-20 475-393-4XXX 4000–4999Assigned METROPCS, INC. 5562 NORWALK CT
2017-09-14 475-319-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J BRIDGEPORT CT
2017-09-08 475-224-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2017-09-05 475-236-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2017-09-05 475-559-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 WATERBURY CT
2017-08-30 475-319-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2017-08-29 475-300-3XXX 3000–3999Assigned METROPCS, INC. 5562 NEW HAVEN 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.