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
2018-07-02 475-459-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NORWALK CT
2018-06-28 475-237-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2018-06-28 475-237-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2018-06-25 475-234-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2018-06-20 475-549-5XXX 5000–5999Assigned ONVOY, LLC - CT 639C MILFORD CT
2018-06-20 475-897-4XXX 4000–4999Assigned TC SYSTEMS, INC. - NY 7140 GREENWICH CT
2018-06-07 475-275-4XXX 4000–4999Assigned ONVOY, LLC - CT 639C BYRAM CT
2018-05-29 475-300-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2018-05-09 475-889-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2018-05-09 475-889-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2018-05-07 475-219-5XXX 5000–5999Assigned ONVOY, LLC - CT 639C WOLCOTT CT
2018-05-07 475-889-7XXX 7000–7999Assigned ONVOY, LLC - CT 639C NORWALK CT
2018-04-27 475-234-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2018-04-27 475-242-9XXX 9000–9999Assigned TELNYX LLC 073H REDDING CT
2018-04-24 475-237-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J DANBURY CT
2018-04-23 475-459-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2018-04-23 475-459-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2018-04-20 475-207-9XXX 9000–9999Assigned TELNYX LLC 073H WOODBURY CT
2018-04-20 475-215-9XXX 9000–9999Assigned TELNYX LLC 073H RIDGEFIELD CT
2018-04-20 475-219-8XXX 8000–8999Assigned TELNYX LLC 073H WOLCOTT CT
2018-04-20 475-244-0XXX 0000–0999Assigned TELNYX LLC 073H CHESHIRE CT
2018-04-20 475-277-8XXX 8000–8999Assigned TELNYX LLC 073H WILTON CT
2018-04-20 475-323-1XXX 1000–1999Assigned TELNYX LLC 073H NEWTOWN CT
2018-04-20 475-325-7XXX 7000–7999Assigned TELNYX LLC 073H GEORGETOWN CT
2018-04-20 475-522-8XXX 8000–8999Assigned TELNYX LLC 073H MADISON CT
2018-04-20 475-675-6XXX 6000–6999Assigned TELNYX LLC 073H SEYMOUR CT
2018-04-03 475-359-6XXX 6000–6999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 STAMFORD CT
2018-03-23 475-233-7XXX 7000–7999Assigned METROPCS, INC. 5562 WATERBURY CT
2018-03-22 475-236-7XXX 7000–7999Assigned METROPCS, INC. 5562 BRIDGEPORT CT
2018-03-22 475-236-8XXX 8000–8999Assigned METROPCS, INC. 5562 BRIDGEPORT CT
2018-03-22 475-300-6XXX 6000–6999Assigned METROPCS, INC. 5562 NEW HAVEN CT
2018-03-22 475-300-7XXX 7000–7999Assigned METROPCS, INC. 5562 NEW HAVEN CT
2018-03-16 475-300-4XXX 4000–4999Assigned METROPCS, INC. 5562 NEW HAVEN CT
2018-03-15 475-231-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TRUMBULL CT
2018-03-15 475-269-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HUNTINGTON CT
2018-03-07 475-338-0XXX 0000–0999Assigned ONVOY, LLC - CT 639C BRANFORD CT
2018-02-22 475-244-1XXX 1000–1999Assigned ONVOY, LLC - CT 639C CHESHIRE CT
2018-02-12 475-889-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2018-02-12 475-889-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2018-02-12 475-889-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2018-02-12 475-889-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2018-01-08 475-228-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2018-01-08 475-228-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2018-01-08 475-237-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 DANBURY CT
2017-12-28 475-237-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2017-12-28 475-237-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2017-12-22 475-236-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT CT
2017-12-22 475-470-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2017-12-22 475-470-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2017-12-19 475-331-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 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.