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
2004-08-18 203-844-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2004-08-17 203-306-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MILFORD CT
2004-08-16 203-604-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NORWALK CT
2004-08-10 203-920-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 NEW CANAAN CT
2004-08-10 203-920-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 NEW CANAAN CT
2004-08-10 203-920-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 NEW CANAAN CT
2004-08-10 203-920-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 NEW CANAAN CT
2004-08-10 203-920-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 NEW CANAAN CT
2004-08-04 203-907-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2004-07-30 203-987-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 GREENWICH CT
2004-07-29 203-620-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2004-07-29 203-620-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2004-07-29 203-620-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2004-07-28 203-742-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 GREENWICH CT
2004-07-27 203-252-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 STAMFORD CT
2004-07-26 203-848-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J NEW HAVEN CT
2004-07-23 203-827-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2004-07-23 203-827-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2004-07-23 203-827-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2004-07-14 203-482-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DANBURY CT
2004-07-12 203-564-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 STAMFORD CT
2004-07-07 203-280-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2004-07-07 203-280-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 DARIEN CT
2004-07-07 203-418-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2004-07-07 203-644-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2004-07-07 203-907-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2004-07-07 203-907-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2004-07-07 203-955-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2004-07-07 203-955-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2004-07-07 203-955-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2004-07-07 203-955-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2004-07-07 203-986-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2004-07-07 203-986-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2004-07-07 203-986-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2004-07-07 203-986-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2004-07-07 203-986-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 OLDGRNWICH CT
2004-07-06 203-508-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J NEW HAVEN CT
2004-07-06 203-508-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J NEW HAVEN CT
2004-07-06 203-508-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J NEW HAVEN CT
2004-07-06 203-508-9XXX 9000–9999Assigned PAETEC ITEL, LLC 829J NEW HAVEN CT
2004-07-06 203-616-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J DANBURY CT
2004-07-06 203-616-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J DANBURY CT
2004-07-06 203-616-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J DANBURY CT
2004-07-06 203-616-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J DANBURY CT
2004-07-02 203-648-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - CT 6624 DANBURY CT
2004-07-02 203-886-6XXX 6000–6999Assigned METROPCS, INC. 5562 MERIDEN CT
2004-07-01 203-428-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CT 4800 STAMFORD CT
2004-06-30 203-810-1XXX 1000–1999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 NORWALK CT
2004-06-30 203-810-2XXX 2000–2999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 NORWALK CT
2004-06-30 203-810-3XXX 3000–3999Assigned CABLEVISION LIGHTPATH, INC. - CT 4950 NORWALK 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.