NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

5 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 203
ONVOY, LLC - CT 5
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
2011-09-14 203-663-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NORWALK CT
2011-09-14 203-941-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F SEYMOUR CT
2011-09-13 203-731-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2011-09-13 203-810-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2011-09-13 203-810-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2011-09-12 203-448-5XXX 5000–5999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 DANBURY CT
2011-09-12 203-658-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2011-09-12 203-802-2XXX 2000–2999Assigned METROPCS, INC. 5562 WATERBURY CT
2011-09-12 203-802-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 WATERBURY CT
2011-08-26 203-714-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J NAUGATUCK CT
2011-08-19 203-864-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2011-08-18 203-697-5XXX 5000–5999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 WALLINGFD CT
2011-08-18 203-697-7XXX 7000–7999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 WALLINGFD CT
2011-08-17 203-600-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MERIDEN CT
2011-08-17 203-600-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MERIDEN CT
2011-08-17 203-635-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WESTPORT CT
2011-08-16 203-600-6XXX 6000–6999Assigned METROPCS, INC. 5562 MERIDEN CT
2011-08-16 203-600-7XXX 7000–7999Assigned METROPCS, INC. 5562 MERIDEN CT
2011-08-08 203-585-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2011-08-08 203-604-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2011-08-03 203-774-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 WALLINGFD CT
2011-08-01 203-842-7XXX 7000–7999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 NORWALK CT
2011-07-27 203-553-9XXX 9000–9999Assigned CSC VOICE, LLC 612K NEW HAVEN CT
2011-07-27 203-614-8XXX 8000–8999Assigned CSC VOICE, LLC 612K STAMFORD CT
2011-07-27 203-920-1XXX 1000–1999Assigned CSC VOICE, LLC 612K NEW CANAAN CT
2011-07-22 203-514-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F MERIDEN CT
2011-07-20 203-297-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2011-07-20 203-309-5XXX 5000–5999Assigned CSC VOICE, LLC 612K DARIEN CT
2011-07-20 203-802-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 WATERBURY CT
2011-07-20 203-997-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F ANSONIDRBY CT
2011-07-18 203-493-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F GEORGETOWN CT
2011-07-13 203-794-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 DANBURY CT
2011-07-12 203-632-7XXX 7000–7999Assigned METROPCS, INC. 5562 NAUGATUCK CT
2011-07-12 203-997-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2011-07-11 203-802-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 WATERBURY CT
2011-07-11 203-810-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2011-07-08 203-460-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2011-07-08 203-864-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT CT
2011-07-06 203-321-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2011-07-06 203-321-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2011-06-28 203-717-2XXX 2000–2999Assigned YMAX COMMUNICATIONS CORP. - CT 350E GREENWICH CT
2011-06-28 203-717-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. - CT 350E GREENWICH CT
2011-06-28 203-945-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NORWALK CT
2011-06-28 203-945-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NORWALK CT
2011-06-23 203-408-5XXX 5000–5999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 REDDING CT
2011-06-23 203-544-5XXX 5000–5999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 GEORGETOWN CT
2011-06-23 203-586-5XXX 5000–5999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 WOODBURY CT
2011-06-23 203-842-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J NORWALK CT
2011-06-08 203-707-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WATERBURY CT
2011-06-08 203-707-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WATERBURY 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.