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
2018-08-21 571-523-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2018-08-21 571-523-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2018-08-16 571-509-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LEESBURG VA
2018-08-16 571-523-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HERNDON VA
2018-08-16 571-595-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN19 VA
2018-08-16 571-616-9XXX 9000–9999Assigned ONVOY, LLC - VA 138E ENGLESIDE VA
2018-08-16 571-619-6XXX 6000–6999Assigned ONVOY, LLC - VA 138E MANASSAS VA
2018-08-02 571-523-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2018-07-17 571-361-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 MANASSAS VA
2018-07-17 571-361-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 MANASSAS VA
2018-07-12 571-324-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2018-07-10 571-347-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2018-07-10 571-347-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2018-07-09 571-394-9XXX 9000–9999Assigned METROPCS, INC. 5562 TRIANGLE VA
2018-07-09 571-404-1XXX 1000–1999Assigned NUSO, LLC 551G BRADDOCK VA
2018-07-03 571-378-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN17 VA
2018-07-03 571-378-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN17 VA
2018-07-03 571-378-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 WSNGTNZN17 VA
2018-07-02 571-300-8XXX 8000–8999Assigned NUSO, LLC 551G DALE CITY VA
2018-07-02 571-368-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 DALE CITY VA
2018-07-02 571-523-0XXX 0000–0999Assigned NUSO, LLC 551G HERNDON VA
2018-07-02 571-636-0XXX 0000–0999Assigned NUSO, LLC 551G HAYMARKET VA
2018-06-28 571-360-0XXX 0000–0999Assigned CORETEL VIRGINIA, LLC - VA 5832 INDENDNTHL VA
2018-06-28 571-360-1XXX 1000–1999Assigned CORETEL VIRGINIA, LLC - VA 5832 INDENDNTHL VA
2018-06-28 571-360-2XXX 2000–2999Assigned CORETEL VIRGINIA, LLC - VA 5832 INDENDNTHL VA
2018-06-28 571-370-0XXX 0000–0999Assigned CORETEL VIRGINIA, LLC - VA 5832 ARCOLA VA
2018-06-28 571-370-1XXX 1000–1999Assigned CORETEL VIRGINIA, LLC - VA 5832 ARCOLA VA
2018-06-28 571-370-2XXX 2000–2999Assigned CORETEL VIRGINIA, LLC - VA 5832 ARCOLA VA
2018-06-28 571-380-0XXX 0000–0999Assigned CORETEL VIRGINIA, LLC - VA 5832 LORTON VA
2018-06-28 571-380-1XXX 1000–1999Assigned CORETEL VIRGINIA, LLC - VA 5832 LORTON VA
2018-06-28 571-380-2XXX 2000–2999Assigned CORETEL VIRGINIA, LLC - VA 5832 LORTON VA
2018-06-28 571-387-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HERNDON VA
2018-06-28 571-387-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HERNDON VA
2018-06-28 571-390-0XXX 0000–0999Assigned CORETEL VIRGINIA, LLC - VA 5832 NOKESVILLE VA
2018-06-28 571-390-1XXX 1000–1999Assigned CORETEL VIRGINIA, LLC - VA 5832 NOKESVILLE VA
2018-06-28 571-390-2XXX 2000–2999Assigned CORETEL VIRGINIA, LLC - VA 5832 NOKESVILLE VA
2018-06-28 571-595-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN19 VA
2018-06-25 571-368-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 DALE CITY VA
2018-06-22 571-491-2XXX 2000–2999Assigned METROPCS, INC. 5562 DULLES VA
2018-06-21 571-523-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2018-06-19 571-427-9XXX 9000–9999Assigned CORETEL VIRGINIA, LLC - VA 5832 OCCOQUAN VA
2018-06-15 571-310-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2018-06-15 571-310-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2018-06-15 571-310-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2018-06-15 571-310-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2018-06-15 571-310-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2018-06-15 571-651-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN17 VA
2018-06-15 571-651-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN17 VA
2018-06-15 571-651-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN17 VA
2018-06-15 571-651-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN17 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.