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
2015-05-06 571-758-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DULLES VA
2015-05-05 571-707-1XXX 1000–1999Assigned METROPCS, INC. 5562 LEESBURG VA
2015-05-04 571-635-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN17 VA
2015-04-30 571-789-0XXX 0000–0999Assigned PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G WSNGTNZN19 VA
2015-04-21 571-365-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRADDOCK VA
2015-04-20 571-992-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN19 VA
2015-04-20 571-992-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN19 VA
2015-04-20 571-992-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN19 VA
2015-04-17 571-339-5XXX 5000–5999Assigned ONVOY, LLC - VA 138E ENGLESIDE VA
2015-04-15 571-777-1XXX 1000–1999Assigned ONVOY, LLC - VA 138E WSNGTNZN08 VA
2015-04-14 571-351-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN08 VA
2015-04-14 571-351-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN08 VA
2015-04-09 571-321-5XXX 5000–5999Assigned ONVOY, LLC - VA 138E BRADDOCK VA
2015-04-07 571-777-0XXX 0000–0999Assigned ONVOY, LLC - VA 138E WSNGTNZN08 VA
2015-04-03 571-665-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2015-03-31 571-486-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAYMARKET VA
2015-03-31 571-486-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAYMARKET VA
2015-03-31 571-486-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAYMARKET VA
2015-03-23 571-777-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2015-03-16 571-570-0XXX 0000–0999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2015-03-16 571-570-1XXX 1000–1999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2015-03-16 571-570-2XXX 2000–2999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2015-03-16 571-589-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2015-03-13 571-376-6XXX 6000–6999Assigned ONVOY, LLC - VA 138E HERNDON VA
2015-03-13 571-376-7XXX 7000–7999Assigned ONVOY, LLC - VA 138E HERNDON VA
2015-03-13 571-376-9XXX 9000–9999Assigned ONVOY, LLC - VA 138E HERNDON VA
2015-03-12 571-349-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - VA 4644 ARCOLA VA
2015-03-11 571-665-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2015-03-10 571-365-9XXX 9000–9999Assigned METROPCS, INC. 5562 BRADDOCK VA
2015-03-05 571-777-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
2015-03-05 571-777-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
2015-03-05 571-777-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
2015-02-27 571-376-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2015-02-19 571-348-8XXX 8000–8999Assigned IP HORIZON LLC 515J LORTON VA
2015-02-19 571-349-1XXX 1000–1999Assigned IP HORIZON LLC 515J ARCOLA VA
2015-02-19 571-469-4XXX 4000–4999Assigned IP HORIZON LLC 515J HAYMARKET VA
2015-02-19 571-589-1XXX 1000–1999Assigned IP HORIZON LLC 515J DALE CITY VA
2015-02-19 571-758-6XXX 6000–6999Assigned IP HORIZON LLC 515J DULLES VA
2015-02-18 571-999-8XXX 8000–8999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2015-02-18 571-999-9XXX 9000–9999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2015-02-02 571-349-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F ARCOLA VA
2015-01-30 571-707-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LEESBURG VA
2015-01-23 571-448-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ENGLESIDE VA
2015-01-23 571-448-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ENGLESIDE VA
2015-01-23 571-448-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ENGLESIDE VA
2015-01-23 571-448-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ENGLESIDE VA
2015-01-23 571-448-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ENGLESIDE VA
2015-01-23 571-448-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ENGLESIDE VA
2015-01-23 571-448-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ENGLESIDE VA
2015-01-23 571-448-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ENGLESIDE 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.