NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

43 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 571
BANDWIDTH.COM CLEC, LLC - VA 11
ONVOY, LLC - VA 10
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
2011-01-31 571-421-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2011-01-31 571-421-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2011-01-31 571-528-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LEESBURG VA
2011-01-31 571-528-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LEESBURG VA
2011-01-13 571-612-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2011-01-12 571-442-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 LEESBURG VA
2011-01-06 571-210-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ARCOLA VA
2011-01-06 571-358-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 MANASSAS VA
2011-01-06 571-421-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2011-01-06 571-421-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2011-01-06 571-814-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN08 VA
2010-12-29 571-612-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2010-12-22 571-421-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2010-12-22 571-533-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN17 VA
2010-12-16 571-281-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 BRADDOCK VA
2010-12-06 571-358-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J MANASSAS VA
2010-11-29 571-372-0XXX 0000–0999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2010-11-29 571-372-1XXX 1000–1999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2010-11-29 571-372-2XXX 2000–2999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2010-11-29 571-372-3XXX 3000–3999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2010-11-29 571-372-4XXX 4000–4999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2010-11-29 571-372-5XXX 5000–5999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2010-11-29 571-372-6XXX 6000–6999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2010-11-29 571-372-7XXX 7000–7999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2010-11-29 571-372-8XXX 8000–8999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2010-11-29 571-372-9XXX 9000–9999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2010-11-29 571-814-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN08 VA
2010-11-24 571-356-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2010-11-24 571-356-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2010-11-24 571-356-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2010-11-24 571-356-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2010-11-24 571-356-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2010-11-24 571-356-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2010-11-24 571-356-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2010-11-24 571-356-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2010-11-24 571-356-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2010-11-19 571-814-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 WSNGTNZN08 VA
2010-11-18 571-355-8XXX 8000–8999Assigned METROPCS, INC. 5562 WSNGTNZN17 VA
2010-11-18 571-355-9XXX 9000–9999Assigned METROPCS, INC. 5562 WSNGTNZN17 VA
2010-11-18 571-389-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2010-11-18 571-528-4XXX 4000–4999Assigned METROPCS, INC. 5562 LEESBURG VA
2010-11-17 571-612-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2010-11-10 571-358-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2010-11-10 571-358-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2010-11-10 571-528-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LEESBURG VA
2010-11-10 571-612-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF VIRGINIA, LLC - VA 7769 HERNDON VA
2010-11-09 571-355-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2010-11-09 571-355-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2010-11-09 571-355-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2010-11-09 571-355-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA

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.