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
2014-10-02 203-447-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HUNTINGTON CT
2014-10-01 203-590-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F TRUMBULL CT
2014-10-01 203-633-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WOLCOTT CT
2014-09-30 203-487-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 STAMFORD CT
2014-09-26 203-810-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NORWALK CT
2014-09-23 203-544-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F GEORGETOWN CT
2014-09-22 203-274-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 STAMFORD CT
2014-09-22 203-356-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 STAMFORD CT
2014-09-18 203-769-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7316 GREENWICH CT
2014-09-12 203-820-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NORWALK CT
2014-09-11 203-439-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J CHESHIRE CT
2014-09-05 203-290-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2014-09-05 203-290-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2014-08-28 203-851-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2014-08-28 203-851-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2014-08-26 203-514-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MERIDEN CT
2014-08-26 203-718-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CHESHIRE CT
2014-08-21 203-327-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J STAMFORD CT
2014-08-12 203-666-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2014-08-12 203-666-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2014-08-12 203-666-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2014-08-12 203-864-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2014-08-07 203-388-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2014-08-07 203-388-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2014-08-07 203-564-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2014-08-07 203-564-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2014-08-07 203-708-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2014-08-07 203-708-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 STAMFORD CT
2014-08-04 203-421-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J MADISON CT
2014-08-04 203-780-9XXX 9000–9999Assigned PAETEC ITEL, LLC 829J NEW HAVEN CT
2014-07-29 203-822-0XXX 0000–0999Assigned METROPCS, INC. 5562 NORWALK CT
2014-07-28 203-951-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F MILFORD CT
2014-07-16 203-704-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J WOLCOTT CT
2014-07-11 203-317-3XXX 3000–3999Assigned METROPCS, INC. 5562 MERIDEN CT
2014-07-11 203-694-1XXX 1000–1999Assigned METROPCS, INC. 5562 MERIDEN CT
2014-06-27 203-290-6XXX 6000–6999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 BRIDGEPORT CT
2014-06-17 203-693-5XXX 5000–5999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 MILFORD CT
2014-06-12 203-429-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WESTPORT CT
2014-06-12 203-774-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WALLINGFD CT
2014-06-12 203-801-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J NEW CANAAN CT
2014-06-12 203-871-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BRANFORD CT
2014-06-06 203-544-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J GEORGETOWN CT
2014-06-06 203-664-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 REDDING CT
2014-06-06 203-704-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WOLCOTT CT
2014-06-06 203-738-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J GUILFORD CT
2014-06-06 203-990-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OLDGRNWICH CT
2014-06-02 203-350-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F MADISON CT
2014-06-02 203-518-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WATERBURY CT
2014-06-02 203-518-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F WATERBURY CT
2014-06-02 203-689-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CT 199F GUILFORD 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.