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
2006-12-08 203-505-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2006-12-08 203-695-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 WATERBURY CT
2006-12-06 203-859-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2006-12-06 203-859-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2006-12-06 203-885-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2006-12-05 203-617-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 DANBURY CT
2006-12-05 203-617-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 DANBURY CT
2006-11-28 203-728-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 STAMFORD CT
2006-11-28 203-728-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 STAMFORD CT
2006-11-28 203-728-2XXX 2000–2999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 STAMFORD CT
2006-11-28 203-728-3XXX 3000–3999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 STAMFORD CT
2006-11-28 203-728-4XXX 4000–4999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 STAMFORD CT
2006-11-28 203-728-5XXX 5000–5999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 STAMFORD CT
2006-11-28 203-728-6XXX 6000–6999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 STAMFORD CT
2006-11-28 203-728-7XXX 7000–7999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 STAMFORD CT
2006-11-28 203-728-8XXX 8000–8999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 STAMFORD CT
2006-11-28 203-728-9XXX 9000–9999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 STAMFORD CT
2006-11-22 203-539-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 STAMFORD CT
2006-11-20 203-698-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J OLDGRNWICH CT
2006-11-20 203-701-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J MILFORD CT
2006-11-15 203-446-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2006-11-15 203-736-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2006-11-09 203-441-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J WOLCOTT CT
2006-11-09 203-463-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J SEYMOUR CT
2006-11-09 203-513-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J HUNTINGTON CT
2006-11-09 203-527-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J WATERBURY CT
2006-11-09 203-527-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J WATERBURY CT
2006-11-09 203-527-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J WATERBURY CT
2006-11-09 203-632-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J NAUGATUCK CT
2006-11-09 203-751-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J ANSONIDRBY CT
2006-11-07 203-517-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J STAMFORD CT
2006-11-01 203-344-2XXX 2000–2999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 OLDGRNWICH CT
2006-11-01 203-642-3XXX 3000–3999Assigned CSC VOICE, LLC 612K NORWALK CT
2006-11-01 203-751-6XXX 6000–6999Assigned SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 ANSONIDRBY CT
2006-10-31 203-885-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2006-10-30 203-465-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 WATERBURY CT
2006-10-30 203-928-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2006-10-26 203-739-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DANBURY CT
2006-10-19 203-793-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J WALLINGFD CT
2006-10-12 203-859-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2006-10-12 203-993-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2006-10-11 203-445-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J TRUMBULL CT
2006-10-10 203-886-5XXX 5000–5999Assigned METROPCS, INC. 5562 MERIDEN CT
2006-09-20 203-806-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J CHESHIRE CT
2006-09-13 203-439-1XXX 1000–1999Assigned METROPCS, INC. 5562 CHESHIRE CT
2006-09-07 203-859-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2006-09-07 203-891-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2006-09-07 203-891-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2006-09-07 203-891-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2006-09-06 203-439-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CHESHIRE 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.