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
2019-02-28 475-557-9XXX 9000–9999Assigned ONVOY, LLC - CT 639C WATERBURY CT
2019-02-27 475-244-6XXX 6000–6999Assigned ONVOY, LLC - CT 639C CHESHIRE CT
2019-02-27 475-244-9XXX 9000–9999Assigned ONVOY, LLC - CT 639C CHESHIRE CT
2019-02-27 475-250-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2019-02-27 475-250-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2019-02-27 475-250-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2019-02-27 475-250-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2019-02-27 475-259-7XXX 7000–7999Assigned ONVOY, LLC - CT 639C DARIEN CT
2019-02-27 475-259-8XXX 8000–8999Assigned ONVOY, LLC - CT 639C DARIEN CT
2019-02-27 475-283-9XXX 9000–9999Assigned ONVOY, LLC - CT 639C NORWALK CT
2019-02-27 475-338-7XXX 7000–7999Assigned ONVOY, LLC - CT 639C BRANFORD CT
2019-02-27 475-338-9XXX 9000–9999Assigned ONVOY, LLC - CT 639C BRANFORD CT
2019-02-27 475-465-7XXX 7000–7999Assigned ONVOY, LLC - CT 639C OLDGRNWICH CT
2019-02-27 475-465-9XXX 9000–9999Assigned ONVOY, LLC - CT 639C OLDGRNWICH CT
2019-02-27 475-489-9XXX 9000–9999Assigned ONVOY, LLC - CT 639C NORWALK CT
2019-02-27 475-549-6XXX 6000–6999Assigned ONVOY, LLC - CT 639C MILFORD CT
2019-02-27 475-549-7XXX 7000–7999Assigned ONVOY, LLC - CT 639C MILFORD CT
2019-02-25 475-236-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 BRIDGEPORT CT
2019-02-25 475-330-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 FAIRFIELD CT
2019-02-21 475-465-4XXX 4000–4999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F OLDGRNWICH CT
2019-02-19 475-254-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2019-02-19 475-557-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 WATERBURY CT
2019-02-18 475-253-2XXX 2000–2999Assigned ONVOY, LLC - CT 639C WALLINGFD CT
2019-02-18 475-253-3XXX 3000–3999Assigned ONVOY, LLC - CT 639C WALLINGFD CT
2019-01-30 475-359-8XXX 8000–8999Assigned ONVOY, LLC - CT 639C STAMFORD CT
2019-01-30 475-685-9XXX 9000–9999Assigned ONVOY, LLC - CT 639C STAMFORD CT
2019-01-29 475-207-2XXX 2000–2999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F WOODBURY CT
2019-01-23 475-259-5XXX 5000–5999Assigned METROPCS, INC. 5562 DARIEN CT
2019-01-09 475-207-6XXX 6000–6999Assigned ONVOY, LLC - CT 639C WOODBURY CT
2019-01-09 475-207-7XXX 7000–7999Assigned ONVOY, LLC - CT 639C WOODBURY CT
2019-01-09 475-207-8XXX 8000–8999Assigned ONVOY, LLC - CT 639C WOODBURY CT
2018-12-31 475-685-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 STAMFORD CT
2018-12-26 475-216-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2018-12-26 475-245-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2018-12-26 475-256-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 DANBURY CT
2018-12-05 475-557-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J WATERBURY CT
2018-11-27 475-685-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 STAMFORD CT
2018-11-26 475-269-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J HUNTINGTON CT
2018-11-26 475-465-2XXX 2000–2999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F OLDGRNWICH CT
2018-11-20 475-701-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J NAUGATUCK CT
2018-11-14 475-251-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2018-11-14 475-251-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2018-11-07 475-666-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 WESTPORT CT
2018-10-30 475-254-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2018-10-25 475-253-9XXX 9000–9999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F WALLINGFD CT
2018-10-18 475-219-9XXX 9000–9999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F WOLCOTT CT
2018-10-18 475-731-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2018-10-17 475-219-6XXX 6000–6999Assigned ONVOY, LLC - CT 639C WOLCOTT CT
2018-10-17 475-219-7XXX 7000–7999Assigned ONVOY, LLC - CT 639C WOLCOTT CT
2018-10-17 475-236-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 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.