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
2015-08-04 571-589-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DALE CITY VA
2015-07-30 571-341-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF VIRGINIA, LLC - VA 7769 WSNGTNZN17 VA
2015-07-29 571-446-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HERNDON VA
2015-07-23 571-290-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2015-07-23 571-635-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2015-07-22 571-620-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN17 VA
2015-07-21 571-290-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN08 VA
2015-07-21 571-290-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN08 VA
2015-07-21 571-341-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2015-07-15 571-365-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRADDOCK VA
2015-07-15 571-524-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2015-07-09 571-341-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2015-07-07 571-599-3XXX 3000–3999Assigned LEVEL 3 TELECOM OF VIRGINIA, LLC - VA 7769 HERNDON VA
2015-07-06 571-719-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MANASSAS VA
2015-07-02 571-599-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2015-06-29 571-570-5XXX 5000–5999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2015-06-29 571-570-6XXX 6000–6999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2015-06-29 571-570-7XXX 7000–7999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2015-06-29 571-570-8XXX 8000–8999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2015-06-29 571-570-9XXX 9000–9999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2015-06-29 571-999-0XXX 0000–0999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2015-06-29 571-999-1XXX 1000–1999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2015-06-29 571-999-6XXX 6000–6999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2015-06-29 571-999-7XXX 7000–7999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2015-06-23 571-343-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 OCCOQUAN VA
2015-06-10 571-363-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN19 VA
2015-06-10 571-363-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN19 VA
2015-06-10 571-363-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN19 VA
2015-06-08 571-599-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HERNDON VA
2015-06-03 571-665-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2015-06-03 571-665-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2015-06-03 571-888-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DULLES VA
2015-06-01 571-665-4XXX 4000–4999Assigned ONVOY, LLC - VA 138E HERNDON VA
2015-06-01 571-719-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 MANASSAS VA
2015-06-01 571-919-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 LEESBURG VA
2015-06-01 571-999-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2015-05-29 571-365-0XXX 0000–0999Assigned PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G BRADDOCK VA
2015-05-28 571-351-1XXX 1000–1999Assigned ONVOY, LLC - VA 138E WSNGTNZN08 VA
2015-05-28 571-351-2XXX 2000–2999Assigned ONVOY, LLC - VA 138E WSNGTNZN08 VA
2015-05-28 571-570-3XXX 3000–3999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2015-05-28 571-570-4XXX 4000–4999Assigned ONVOY, LLC - VA 138E WSNGTNZN17 VA
2015-05-28 571-789-1XXX 1000–1999Assigned ONVOY, LLC - VA 138E WSNGTNZN19 VA
2015-05-28 571-789-2XXX 2000–2999Assigned ONVOY, LLC - VA 138E WSNGTNZN19 VA
2015-05-27 571-351-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J WSNGTNZN08 VA
2015-05-26 571-589-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2015-05-22 571-665-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2015-05-22 571-665-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2015-05-14 571-406-1XXX 1000–1999Assigned PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G TRIANGLE VA
2015-05-08 571-999-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2015-05-08 571-999-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 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.