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
2003-07-14 203-442-3XXX 3000–3999Assigned METROPCS, INC. 5562 NEW CANAAN CT
2003-07-11 203-273-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2003-07-10 203-228-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 WATERBURY CT
2003-07-10 203-313-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2003-07-10 203-642-4XXX 4000–4999Assigned CSC VOICE, LLC 612K NORWALK CT
2003-07-09 203-610-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT CT
2003-07-09 203-687-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2003-07-09 203-687-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2003-06-30 203-228-5XXX 5000–5999Assigned CSC VOICE, LLC 612K WATERBURY CT
2003-06-27 203-228-7XXX 7000–7999Assigned METROPCS, INC. 5562 WATERBURY CT
2003-06-27 203-648-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 DANBURY CT
2003-06-27 203-648-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 DANBURY CT
2003-06-27 203-673-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2003-06-27 203-687-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2003-06-27 203-687-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2003-06-27 203-687-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2003-06-26 203-513-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 HUNTINGTON CT
2003-06-26 203-923-7XXX 7000–7999Assigned METROPCS, INC. 5562 BRIDGEPORT CT
2003-06-25 203-202-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2003-06-19 203-274-5XXX 5000–5999Assigned CSC VOICE, LLC 612K STAMFORD CT
2003-06-05 203-273-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2003-06-03 203-808-2XXX 2000–2999Assigned METROPCS, INC. 5562 WATERBURY CT
2003-05-29 203-278-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ANSONIDRBY CT
2003-05-29 203-283-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MILFORD CT
2003-05-29 203-303-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WALLINGFD CT
2003-05-29 203-400-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 TRUMBULL CT
2003-05-29 203-423-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 WILTON CT
2003-05-29 203-447-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HUNTINGTON CT
2003-05-29 203-643-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BRANFORD CT
2003-05-29 203-809-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2003-05-14 203-660-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 BYRAM CT
2003-05-13 203-742-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 GREENWICH CT
2003-05-02 203-228-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 WATERBURY CT
2003-05-02 203-529-2XXX 2000–2999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 WILTON CT
2003-05-02 203-559-6XXX 6000–6999Assigned METROPCS, INC. 5562 DARIEN CT
2003-05-02 203-559-7XXX 7000–7999Assigned METROPCS, INC. 5562 DARIEN CT
2003-05-02 203-610-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT CT
2003-05-02 203-687-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2003-04-30 203-548-3XXX 3000–3999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 STAMFORD CT
2003-04-23 203-480-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2003-04-21 203-277-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2003-04-21 203-277-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2003-04-21 203-277-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2003-04-21 203-277-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2003-04-21 203-277-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2003-04-21 203-277-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2003-04-21 203-277-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2003-04-21 203-277-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2003-04-21 203-277-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2003-04-21 203-277-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH 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.