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
2011-11-16 571-633-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2011-11-09 571-267-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2011-11-09 571-267-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2011-11-09 571-388-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN08 VA
2011-11-09 571-388-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN08 VA
2011-11-09 571-392-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2011-11-09 571-392-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2011-11-09 571-392-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2011-11-07 571-389-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2011-11-07 571-422-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN17 VA
2011-11-07 571-858-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
2011-11-04 571-492-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J OCCOQUAN VA
2011-11-01 571-206-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J LEESBURG VA
2011-10-19 571-447-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN08 VA
2011-10-11 571-989-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J DALE CITY VA
2011-10-07 571-267-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 HERNDON VA
2011-10-07 571-389-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2011-10-07 571-442-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 LEESBURG VA
2011-09-30 571-248-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HAYMARKET VA
2011-09-30 571-267-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2011-09-30 571-989-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 DALE CITY VA
2011-09-28 571-858-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
2011-09-16 571-367-4XXX 4000–4999Assigned VERIZON SOUTH, INC. - VA (CONTEL) 0233 ARCOLA VA
2011-09-16 571-512-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN19 VA
2011-09-14 571-388-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN08 VA
2011-09-14 571-388-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN08 VA
2011-09-14 571-388-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN08 VA
2011-09-14 571-389-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2011-09-14 571-389-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2011-09-13 571-392-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2011-09-12 571-359-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 MANASSAS VA
2011-09-12 571-359-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 MANASSAS VA
2011-09-02 571-385-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN17 VA
2011-09-02 571-385-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN17 VA
2011-09-02 571-385-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN17 VA
2011-09-02 571-385-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN17 VA
2011-09-02 571-385-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN17 VA
2011-09-02 571-418-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2011-09-02 571-418-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2011-09-02 571-418-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2011-09-02 571-418-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2011-09-02 571-418-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2011-09-02 571-418-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2011-09-02 571-418-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2011-09-02 571-418-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2011-09-02 571-418-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2011-09-01 571-267-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F HERNDON VA
2011-08-31 571-659-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2011-08-25 571-356-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN17 VA
2011-08-25 571-419-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 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.