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
2005-01-13 203-599-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 MERIDEN CT
2005-01-13 203-644-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2005-01-13 203-803-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NORWALK CT
2005-01-10 203-633-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 WOLCOTT CT
2005-01-10 203-636-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2005-01-10 203-636-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2005-01-10 203-636-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2005-01-10 203-636-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2005-01-10 203-636-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2005-01-10 203-636-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2005-01-10 203-636-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2005-01-10 203-774-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 WALLINGFD CT
2005-01-10 203-827-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2005-01-10 203-827-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2005-01-10 203-827-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2005-01-10 203-827-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2005-01-10 203-827-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2005-01-10 203-827-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2005-01-10 203-827-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2005-01-10 203-844-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2005-01-10 203-844-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2005-01-10 203-844-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2005-01-05 203-340-2XXX 2000–2999Assigned CSC VOICE, LLC 612K GREENWICH CT
2005-01-05 203-490-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NAUGATUCK CT
2005-01-05 203-599-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 MERIDEN CT
2005-01-05 203-702-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 DANBURY CT
2005-01-05 203-803-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NORWALK CT
2004-12-21 203-220-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K TRUMBULL CT
2004-12-21 203-304-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K NEWTOWN CT
2004-12-21 203-502-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BRIDGEPORT CT
2004-12-21 203-546-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K DANBURY CT
2004-12-20 203-583-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2004-12-20 203-635-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 WESTPORT CT
2004-12-14 203-303-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 WALLINGFD CT
2004-12-14 203-404-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NEW HAVEN CT
2004-12-14 203-446-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 ANSONIDRBY CT
2004-12-14 203-446-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 ANSONIDRBY CT
2004-12-08 203-252-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 STAMFORD CT
2004-12-08 203-312-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2004-12-08 203-313-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2004-12-08 203-508-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2004-12-08 203-644-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2004-12-08 203-706-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 WATERBURY CT
2004-12-08 203-848-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2004-12-08 203-848-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2004-12-06 203-844-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 FAIRFIELD CT
2004-12-01 203-725-1XXX 1000–1999Assigned METROPCS, INC. 5562 WATERBURY CT
2004-11-30 203-549-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2004-11-22 203-244-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J RIDGEFIELD CT
2004-11-22 203-300-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J DANBURY 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.