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
2012-01-18 203-343-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2012-01-18 203-343-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2012-01-18 203-684-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NEW HAVEN CT
2012-01-12 203-832-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 STAMFORD CT
2011-12-29 203-286-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NORWALK CT
2011-12-29 203-456-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 DANBURY CT
2011-12-12 203-533-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GUILFORD CT
2011-12-07 203-418-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 FAIRFIELD CT
2011-12-07 203-590-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 TRUMBULL CT
2011-12-07 203-836-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2011-12-07 203-836-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2011-11-16 203-489-0XXX 0000–0999Assigned PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F GREENWICH CT
2011-11-16 203-945-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NORWALK CT
2011-11-16 203-945-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NORWALK CT
2011-11-11 203-442-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW CANAAN CT
2011-11-09 203-997-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2011-11-07 203-817-0XXX 0000–0999Assigned CSC VOICE, LLC 612K STAMFORD CT
2011-11-02 203-590-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 TRUMBULL CT
2011-11-02 203-997-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2011-10-28 203-917-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J DANBURY CT
2011-10-26 203-318-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MADISON CT
2011-10-26 203-408-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F REDDING CT
2011-10-24 203-819-4XXX 4000–4999Assigned METROPCS, INC. 5562 WATERBURY CT
2011-10-24 203-917-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 DANBURY CT
2011-10-04 203-724-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2011-10-04 203-939-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2011-10-04 203-939-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2011-09-30 203-519-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - CT 350E WATERBURY CT
2011-09-30 203-519-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - CT 350E WATERBURY CT
2011-09-30 203-658-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. - CT 350E STAMFORD CT
2011-09-30 203-658-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - CT 350E STAMFORD CT
2011-09-30 203-684-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. - CT 350E NEW HAVEN CT
2011-09-30 203-684-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - CT 350E NEW HAVEN CT
2011-09-30 203-726-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - CT 350E BRIDGEPORT CT
2011-09-30 203-726-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - CT 350E BRIDGEPORT CT
2011-09-30 203-726-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - CT 350E BRIDGEPORT CT
2011-09-30 203-820-2XXX 2000–2999Assigned YMAX COMMUNICATIONS CORP. - CT 350E NORWALK CT
2011-09-30 203-826-0XXX 0000–0999Assigned YMAX COMMUNICATIONS CORP. - CT 350E DANBURY CT
2011-09-30 203-826-1XXX 1000–1999Assigned YMAX COMMUNICATIONS CORP. - CT 350E DANBURY CT
2011-09-30 203-842-1XXX 1000–1999Assigned YMAX COMMUNICATIONS CORP. - CT 350E NORWALK CT
2011-09-28 203-690-1XXX 1000–1999Assigned CSC VOICE, LLC 612K BRIDGEPORT CT
2011-09-22 203-997-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2011-09-22 203-997-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2011-09-22 203-997-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2011-09-21 203-658-2XXX 2000–2999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 STAMFORD CT
2011-09-21 203-989-1XXX 1000–1999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 STAMFORD CT
2011-09-16 203-957-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2011-09-16 203-998-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2011-09-14 203-361-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F NEW HAVEN CT
2011-09-14 203-614-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F STAMFORD 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.