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
2016-03-23 475-225-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT CT
2016-03-23 475-279-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2016-03-23 475-279-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2016-03-23 475-313-3XXX 3000–3999Assigned METROPCS, INC. 5562 WATERBURY CT
2016-03-22 475-230-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-22 475-230-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW HAVEN CT
2016-03-18 475-224-2XXX 2000–2999Assigned ONVOY, LLC - CT 639C NEW HAVEN CT
2016-03-18 475-224-3XXX 3000–3999Assigned ONVOY, LLC - CT 639C NEW HAVEN CT
2016-03-18 475-224-4XXX 4000–4999Assigned ONVOY, LLC - CT 639C NEW HAVEN CT
2016-03-17 475-470-4XXX 4000–4999Assigned METROPCS, INC. 5562 NORWALK CT
2016-02-23 475-275-7XXX 7000–7999Assigned ONVOY, LLC - CT 639C BYRAM CT
2016-02-23 475-275-8XXX 8000–8999Assigned ONVOY, LLC - CT 639C BYRAM CT
2016-02-19 475-207-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K WOODBURY CT
2016-02-16 475-323-2XXX 2000–2999Assigned CHARTER IP ENABLED SERVICES, LLC 792K NEWTOWN CT
2016-02-12 475-470-7XXX 7000–7999Assigned ONVOY, LLC - CT 639C NORWALK CT
2016-02-12 475-470-8XXX 8000–8999Assigned ONVOY, LLC - CT 639C NORWALK CT
2016-02-10 475-897-7XXX 7000–7999Assigned ONVOY, LLC - CT 639C GREENWICH CT
2016-02-10 475-897-9XXX 9000–9999Assigned ONVOY, LLC - CT 639C GREENWICH CT
2016-02-08 475-292-2XXX 2000–2999Assigned ONVOY, LLC - CT 639C STAMFORD CT
2016-02-08 475-292-3XXX 3000–3999Assigned ONVOY, LLC - CT 639C STAMFORD CT
2016-02-08 475-775-7XXX 7000–7999Assigned ONVOY, LLC - CT 639C MERIDEN CT
2016-02-08 475-775-8XXX 8000–8999Assigned ONVOY, LLC - CT 639C MERIDEN CT
2016-02-04 475-219-2XXX 2000–2999Assigned ONVOY, LLC - CT 639C WOLCOTT CT
2016-02-04 475-219-3XXX 3000–3999Assigned ONVOY, LLC - CT 639C WOLCOTT CT
2016-02-03 475-283-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2016-02-03 475-283-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2016-02-03 475-559-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 WATERBURY CT
2016-01-29 475-228-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 ANSONIDRBY CT
2016-01-29 475-292-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 STAMFORD CT
2016-01-29 475-331-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2016-01-29 475-343-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MERIDEN CT
2016-01-27 475-313-0XXX 0000–0999Assigned ONVOY, LLC - CT 639C WATERBURY CT
2016-01-27 475-313-1XXX 1000–1999Assigned ONVOY, LLC - CT 639C WATERBURY CT
2016-01-20 475-283-4XXX 4000–4999Assigned METROPCS, INC. 5562 NORWALK CT
2016-01-19 475-218-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DANBURY CT
2016-01-19 475-218-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DANBURY CT
2016-01-11 475-239-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TRUMBULL CT
2016-01-11 475-283-8XXX 8000–8999Assigned METROPCS, INC. 5562 NORWALK CT
2016-01-11 475-323-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEWTOWN CT
2016-01-07 475-218-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 DANBURY CT
2016-01-07 475-266-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NORWALK CT
2016-01-07 475-266-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NORWALK 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.