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
2004-11-22 203-533-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J GUILFORD CT
2004-11-22 203-626-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J WALLINGFD CT
2004-11-22 203-779-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J MADISON CT
2004-11-17 203-349-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 WESTPORT CT
2004-11-15 203-463-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 SEYMOUR CT
2004-11-15 203-651-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 CHESHIRE CT
2004-11-15 203-951-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 MILFORD CT
2004-11-12 203-871-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 BRANFORD CT
2004-11-09 203-433-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J BRANFORD CT
2004-11-08 203-542-2XXX 2000–2999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 GREENWICH CT
2004-11-05 203-404-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NEW HAVEN CT
2004-11-04 203-313-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2004-11-04 203-848-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2004-11-03 203-504-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J STAMFORD CT
2004-10-15 203-437-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 WATERBURY CT
2004-10-15 203-493-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 GEORGETOWN CT
2004-10-15 203-636-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 DARIEN CT
2004-10-12 203-648-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 DANBURY CT
2004-10-12 203-823-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2004-10-11 203-300-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DANBURY CT
2004-10-11 203-612-6XXX 6000–6999Assigned CSC VOICE, LLC 612K BRIDGEPORT CT
2004-10-11 203-612-7XXX 7000–7999Assigned CSC VOICE, LLC 612K BRIDGEPORT CT
2004-10-11 203-612-8XXX 8000–8999Assigned CSC VOICE, LLC 612K BRIDGEPORT CT
2004-10-11 203-871-7XXX 7000–7999Assigned METROPCS, INC. 5562 BRANFORD CT
2004-10-06 203-907-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2004-09-28 203-522-4XXX 4000–4999Assigned CSC VOICE, LLC 612K BRIDGEPORT CT
2004-09-28 203-522-5XXX 5000–5999Assigned CSC VOICE, LLC 612K BRIDGEPORT CT
2004-09-21 203-460-4XXX 4000–4999Assigned METROPCS, INC. 5562 DANBURY CT
2004-09-21 203-823-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2004-09-16 203-636-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2004-09-16 203-636-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2004-09-15 203-304-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J NEWTOWN CT
2004-09-15 203-403-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J RIDGEFIELD CT
2004-09-08 203-673-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2004-09-03 203-313-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2004-09-02 203-620-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2004-09-02 203-620-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2004-09-02 203-620-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2004-09-02 203-620-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2004-09-02 203-620-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2004-09-02 203-620-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2004-09-02 203-620-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2004-09-02 203-844-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2004-09-02 203-844-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2004-09-02 203-844-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2004-08-24 203-583-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 BRIDGEPORT CT
2004-08-24 203-654-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NEW HAVEN CT
2004-08-18 203-347-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 BYRAM CT
2004-08-18 203-844-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2004-08-18 203-844-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD 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.