NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

41 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
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
2020-09-03 571-520-6XXX 6000–6999Assigned ONVOY, LLC - VA 138E HERNDON VA
2020-09-03 571-520-7XXX 7000–7999Assigned ONVOY, LLC - VA 138E HERNDON VA
2020-09-03 571-520-8XXX 8000–8999Assigned ONVOY, LLC - VA 138E HERNDON VA
2020-09-03 571-520-9XXX 9000–9999Assigned ONVOY, LLC - VA 138E HERNDON VA
2020-09-03 571-946-1XXX 1000–1999Assigned ONVOY, LLC - VA 138E MANASSAS VA
2020-09-03 571-946-2XXX 2000–2999Assigned ONVOY, LLC - VA 138E MANASSAS VA
2020-09-03 571-946-8XXX 8000–8999Assigned ONVOY, LLC - VA 138E MANASSAS VA
2020-09-03 571-946-9XXX 9000–9999Assigned ONVOY, LLC - VA 138E MANASSAS VA
2020-09-02 571-493-9XXX 9000–9999Assigned ONVOY, LLC - VA 138E DALE CITY VA
2020-09-02 571-554-7XXX 7000–7999Assigned ONVOY, LLC - VA 138E DALE CITY VA
2020-09-02 571-677-5XXX 5000–5999Assigned ONVOY, LLC - VA 138E DALE CITY VA
2020-09-02 571-677-6XXX 6000–6999Assigned ONVOY, LLC - VA 138E DALE CITY VA
2020-09-01 571-946-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 MANASSAS VA
2020-08-31 571-539-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2020-08-31 571-539-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2020-08-17 571-895-8XXX 8000–8999Assigned TWILIO INTERNATIONAL, INC. 506J WSNGTNZN08 VA
2020-08-10 571-467-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN08 VA
2020-08-10 571-467-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN08 VA
2020-08-10 571-467-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN08 VA
2020-08-10 571-467-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN08 VA
2020-08-10 571-771-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN08 VA
2020-08-10 571-771-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN08 VA
2020-08-10 571-771-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN08 VA
2020-08-04 571-601-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 LEESBURG VA
2020-08-03 571-621-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 MANASSAS VA
2020-07-28 571-521-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HERNDON VA
2020-07-28 571-877-7XXX 7000–7999Assigned FRACTEL, LLC 965H LORTONMTRO VA
2020-07-28 571-901-3XXX 3000–3999Assigned METROPCS, INC. 5562 ENGLESIDE VA
2020-07-27 571-461-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2020-07-27 571-601-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - VA 4644 LEESBURG VA
2020-07-27 571-695-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2020-07-21 571-450-8XXX 8000–8999Assigned ONVOY, LLC - VA 138E LORTON VA
2020-07-21 571-450-9XXX 9000–9999Assigned ONVOY, LLC - VA 138E LORTON VA
2020-07-21 571-462-2XXX 2000–2999Assigned ONVOY, LLC - VA 138E OCCOQUAN VA
2020-07-21 571-462-6XXX 6000–6999Assigned ONVOY, LLC - VA 138E OCCOQUAN VA
2020-07-21 571-475-8XXX 8000–8999Assigned ONVOY, LLC - VA 138E BRADDOCK VA
2020-07-21 571-475-9XXX 9000–9999Assigned ONVOY, LLC - VA 138E BRADDOCK VA
2020-07-21 571-487-7XXX 7000–7999Assigned ONVOY, LLC - VA 138E ARCOLA VA
2020-07-21 571-487-8XXX 8000–8999Assigned ONVOY, LLC - VA 138E ARCOLA VA
2020-07-21 571-496-8XXX 8000–8999Assigned ONVOY, LLC - VA 138E LORTONMTRO VA
2020-07-21 571-496-9XXX 9000–9999Assigned ONVOY, LLC - VA 138E LORTONMTRO VA
2020-07-21 571-554-5XXX 5000–5999Assigned ONVOY, LLC - VA 138E DALE CITY VA
2020-07-21 571-554-6XXX 6000–6999Assigned ONVOY, LLC - VA 138E DALE CITY VA
2020-07-21 571-755-4XXX 4000–4999Assigned ONVOY, LLC - VA 138E HAYMARKET VA
2020-07-21 571-755-6XXX 6000–6999Assigned ONVOY, LLC - VA 138E HAYMARKET VA
2020-07-16 571-470-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2020-07-16 571-470-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2020-07-16 571-493-1XXX 1000–1999Assigned TELNYX LLC 073H DALE CITY VA
2020-07-16 571-946-4XXX 4000–4999Assigned ONVOY, LLC - VA 138E MANASSAS VA
2020-07-16 571-946-5XXX 5000–5999Assigned ONVOY, LLC - VA 138E MANASSAS 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.