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
2014-01-28 571-304-1XXX 1000–1999Assigned VERIZON VIRGINIA, INC. 9213 HERNDON VA
2014-01-28 571-304-2XXX 2000–2999Assigned VERIZON VIRGINIA, INC. 9213 HERNDON VA
2014-01-28 571-304-3XXX 3000–3999Assigned VERIZON VIRGINIA, INC. 9213 HERNDON VA
2014-01-28 571-304-4XXX 4000–4999Assigned VERIZON VIRGINIA, INC. 9213 HERNDON VA
2014-01-28 571-304-5XXX 5000–5999Assigned VERIZON VIRGINIA, INC. 9213 HERNDON VA
2014-01-28 571-304-6XXX 6000–6999Assigned VERIZON VIRGINIA, INC. 9213 HERNDON VA
2014-01-28 571-304-7XXX 7000–7999Assigned VERIZON VIRGINIA, INC. 9213 HERNDON VA
2014-01-28 571-304-8XXX 8000–8999Assigned VERIZON VIRGINIA, INC. 9213 HERNDON VA
2014-01-28 571-304-9XXX 9000–9999Assigned VERIZON VIRGINIA, INC. 9213 HERNDON VA
2014-01-16 571-364-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J MANASSAS VA
2014-01-15 571-279-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN19 VA
2014-01-15 571-326-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2014-01-15 571-326-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2014-01-10 571-395-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN17 VA
2014-01-10 571-406-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J TRIANGLE VA
2014-01-08 571-458-1XXX 1000–1999Assigned NUSO, LLC 551G WSNGTNZN08 VA
2014-01-03 571-253-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2014-01-03 571-364-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 MANASSAS VA
2013-12-19 571-364-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2013-12-19 571-888-8XXX 8000–8999Assigned PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G DULLES VA
2013-12-16 571-325-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2013-12-16 571-343-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 OCCOQUAN VA
2013-12-10 571-424-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-12-10 571-424-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-12-10 571-424-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-12-10 571-424-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-12-10 571-424-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-12-03 571-298-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2013-11-27 571-452-0XXX 0000–0999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2013-11-27 571-452-1XXX 1000–1999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2013-11-27 571-452-2XXX 2000–2999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2013-11-27 571-452-3XXX 3000–3999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2013-11-27 571-452-4XXX 4000–4999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2013-11-27 571-452-5XXX 5000–5999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2013-11-27 571-452-6XXX 6000–6999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2013-11-27 571-452-7XXX 7000–7999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2013-11-27 571-452-8XXX 8000–8999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2013-11-27 571-452-9XXX 9000–9999Assigned VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2013-11-27 571-699-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2013-11-25 571-699-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN08 VA
2013-11-25 571-699-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN08 VA
2013-11-25 571-699-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN08 VA
2013-11-25 571-699-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN08 VA
2013-11-07 571-982-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2013-11-01 571-253-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN17 VA
2013-11-01 571-348-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F LORTON VA
2013-11-01 571-398-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F OCCOQUAN VA
2013-11-01 571-699-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN08 VA
2013-10-25 571-279-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN19 VA
2013-10-23 571-326-4XXX 4000–4999Assigned 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.