NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

41 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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 571
ONVOY, LLC - VA 10
BANDWIDTH.COM CLEC, LLC - VA 9
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 7
NEW CINGULAR WIRELESS PCS, LLC - DC 6
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6
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
2016-07-12 571-549-3XXX 3000–3999Assigned ONVOY, LLC - VA 138E BRADDOCK VA
2016-06-30 571-466-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 TRIANGLE VA
2016-06-24 571-719-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F MANASSAS VA
2016-06-23 571-260-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F DALE CITY VA
2016-06-23 571-486-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F HAYMARKET VA
2016-06-23 571-492-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F OCCOQUAN VA
2016-06-22 571-549-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F BRADDOCK VA
2016-06-20 571-349-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F ARCOLA VA
2016-06-20 571-363-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2016-06-20 571-565-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN17 VA
2016-06-20 571-707-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F LEESBURG VA
2016-06-14 571-352-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2016-06-14 571-635-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2016-06-14 571-635-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2016-06-14 571-635-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2016-06-14 571-778-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 MANASSAS VA
2016-06-14 571-778-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 MANASSAS VA
2016-06-13 571-260-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 DALE CITY VA
2016-06-07 571-707-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 LEESBURG VA
2016-06-07 571-800-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2016-06-02 571-459-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN19 VA
2016-06-01 571-352-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HERNDON VA
2016-06-01 571-365-4XXX 4000–4999Assigned US LEC OF VIRGININA, LLC 8357 BRADDOCK VA
2016-06-01 571-549-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRADDOCK VA
2016-05-24 571-376-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J HERNDON VA
2016-05-16 571-665-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2016-05-13 571-775-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN08 VA
2016-05-11 571-549-6XXX 6000–6999Assigned ONVOY, LLC - VA 138E BRADDOCK VA
2016-05-11 571-549-7XXX 7000–7999Assigned ONVOY, LLC - VA 138E BRADDOCK VA
2016-05-09 571-342-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 HERNDON VA
2016-04-27 571-707-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J LEESBURG VA
2016-04-26 571-444-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2016-04-21 571-775-1XXX 1000–1999Assigned ONVOY, LLC - VA 138E WSNGTNZN08 VA
2016-04-21 571-775-2XXX 2000–2999Assigned ONVOY, LLC - VA 138E WSNGTNZN08 VA
2016-04-21 571-775-3XXX 3000–3999Assigned ONVOY, LLC - VA 138E WSNGTNZN08 VA
2016-04-12 571-489-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN17 VA
2016-04-05 571-320-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 TRIANGLE VA
2016-04-05 571-320-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 TRIANGLE VA
2016-04-05 571-320-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 TRIANGLE VA
2016-03-31 571-343-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 OCCOQUAN VA
2016-03-31 571-343-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 OCCOQUAN VA
2016-03-31 571-351-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN08 VA
2016-03-31 571-351-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN08 VA
2016-03-31 571-444-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN08 VA
2016-03-24 571-489-6XXX 6000–6999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2016-03-24 571-489-7XXX 7000–7999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2016-03-22 571-373-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 WSNGTNZN19 VA
2016-03-22 571-373-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 WSNGTNZN19 VA
2016-03-16 571-775-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J WSNGTNZN08 VA
2016-03-03 571-444-8XXX 8000–8999Assigned NUSO, LLC 551G WSNGTNZN08 VA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.