NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

5 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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
2003-04-21 203-310-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 NEW CANAAN CT
2003-04-21 203-310-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 NEW CANAAN CT
2003-04-21 203-310-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 NEW CANAAN CT
2003-04-21 203-310-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 NEW CANAAN CT
2003-04-21 203-310-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 NEW CANAAN CT
2003-04-21 203-310-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 NEW CANAAN CT
2003-04-21 203-310-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 NEW CANAAN CT
2003-04-21 203-310-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 NEW CANAAN CT
2003-04-21 203-310-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 NEW CANAAN CT
2003-04-21 203-310-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 NEW CANAAN CT
2003-04-21 203-320-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2003-04-21 203-320-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2003-04-21 203-320-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2003-04-21 203-320-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2003-04-21 203-320-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2003-04-21 203-320-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2003-04-21 203-320-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2003-04-21 203-320-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2003-04-21 203-320-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2003-04-21 203-320-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2003-04-21 203-480-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2003-04-21 203-480-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2003-04-21 203-927-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2003-04-15 203-809-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2003-04-14 203-273-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2003-04-14 203-273-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2003-04-14 203-346-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J WATERBURY CT
2003-04-14 203-610-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT CT
2003-04-14 203-610-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT CT
2003-04-14 203-610-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT CT
2003-04-14 203-980-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2003-04-11 203-480-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2003-04-04 203-480-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2003-04-04 203-548-2XXX 2000–2999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 STAMFORD CT
2003-04-04 203-548-4XXX 4000–4999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 STAMFORD CT
2003-04-02 203-244-3XXX 3000–3999Assigned CSC VOICE, LLC 612K RIDGEFIELD CT
2003-04-02 203-276-0XXX 0000–0999Assigned CSC VOICE, LLC 612K STAMFORD CT
2003-04-02 203-276-1XXX 1000–1999Assigned CSC VOICE, LLC 612K STAMFORD CT
2003-04-02 203-276-2XXX 2000–2999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 STAMFORD CT
2003-04-02 203-276-3XXX 3000–3999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 STAMFORD CT
2003-04-02 203-276-4XXX 4000–4999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 STAMFORD CT
2003-04-02 203-276-5XXX 5000–5999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 STAMFORD CT
2003-04-02 203-276-6XXX 6000–6999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 STAMFORD CT
2003-04-02 203-276-7XXX 7000–7999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 STAMFORD CT
2003-04-02 203-276-8XXX 8000–8999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 STAMFORD CT
2003-04-02 203-276-9XXX 9000–9999Assigned CSC VOICE, LLC 612K STAMFORD CT
2003-03-26 203-480-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2003-03-24 203-480-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2003-03-11 203-654-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2003-03-10 203-542-4XXX 4000–4999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 GREENWICH CT

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.