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
2012-02-03 571-206-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F LEESBURG VA
2012-02-03 571-388-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN08 VA
2012-01-27 571-328-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN19 VA
2012-01-25 571-441-0XXX 0000–0999Assigned PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G HERNDON VA
2012-01-25 571-441-3XXX 3000–3999Assigned PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G HERNDON VA
2012-01-25 571-441-4XXX 4000–4999Assigned PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G HERNDON VA
2012-01-25 571-441-5XXX 5000–5999Assigned PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G HERNDON VA
2012-01-25 571-441-6XXX 6000–6999Assigned PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G HERNDON VA
2012-01-25 571-441-7XXX 7000–7999Assigned PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G HERNDON VA
2012-01-25 571-441-8XXX 8000–8999Assigned PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G HERNDON VA
2012-01-25 571-441-9XXX 9000–9999Assigned PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G HERNDON VA
2012-01-20 571-359-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2012-01-20 571-383-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2012-01-20 571-383-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2012-01-20 571-383-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2012-01-20 571-383-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2012-01-20 571-393-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2012-01-20 571-528-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LEESBURG VA
2012-01-20 571-528-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LEESBURG VA
2012-01-20 571-528-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LEESBURG VA
2012-01-12 571-392-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2012-01-11 571-528-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 LEESBURG VA
2012-01-10 571-353-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2012-01-10 571-353-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2012-01-10 571-392-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2012-01-10 571-392-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2012-01-10 571-492-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J OCCOQUAN VA
2012-01-05 571-483-5XXX 5000–5999Assigned ONVOY, LLC - VA 138E WSNGTNZN08 VA
2012-01-03 571-306-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2011-12-08 571-359-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 MANASSAS VA
2011-12-07 571-442-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J LEESBURG VA
2011-12-06 571-254-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 TRIANGLE VA
2011-12-06 571-254-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 TRIANGLE VA
2011-12-06 571-254-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 TRIANGLE VA
2011-12-06 571-254-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 TRIANGLE VA
2011-12-06 571-254-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 TRIANGLE VA
2011-12-06 571-254-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 TRIANGLE VA
2011-12-06 571-254-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 TRIANGLE VA
2011-12-06 571-254-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 TRIANGLE VA
2011-12-06 571-254-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 TRIANGLE VA
2011-12-06 571-254-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 TRIANGLE VA
2011-12-01 571-383-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 MANASSAS VA
2011-11-30 571-392-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HERNDON VA
2011-11-23 571-392-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J HERNDON VA
2011-11-21 571-328-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN19 VA
2011-11-21 571-353-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 HERNDON VA
2011-11-21 571-733-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN08 VA
2011-11-21 571-835-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2011-11-16 571-423-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2011-11-16 571-594-8XXX 8000–8999Assigned 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.