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
2017-06-27 571-867-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
2017-06-27 571-867-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
2017-06-16 571-457-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2017-06-15 571-369-9XXX 9000–9999Assigned IP HORIZON LLC 515J WSNGTNZN17 VA
2017-06-15 571-373-3XXX 3000–3999Assigned IP HORIZON LLC 515J WSNGTNZN19 VA
2017-06-06 571-260-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 DALE CITY VA
2017-05-31 571-369-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J WSNGTNZN17 VA
2017-05-31 571-371-9XXX 9000–9999Assigned PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G WSNGTNZN08 VA
2017-05-22 571-552-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DALE CITY VA
2017-05-22 571-660-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TRIANGLE VA
2017-05-22 571-660-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TRIANGLE VA
2017-05-22 571-867-5XXX 5000–5999Assigned COMMIO, LLC 939H WSNGTNZN08 VA
2017-05-19 571-459-7XXX 7000–7999Assigned ONVOY, LLC - VA 138E WSNGTNZN19 VA
2017-05-16 571-427-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 OCCOQUAN VA
2017-05-12 571-371-1XXX 1000–1999Assigned ONVOY, LLC - VA 138E WSNGTNZN08 VA
2017-05-09 571-642-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J ENGLESIDE VA
2017-05-08 571-336-0XXX 0000–0999Assigned ONVOY, LLC - VA 138E ENGLESIDE VA
2017-05-08 571-371-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2017-05-08 571-778-5XXX 5000–5999Assigned ONVOY, LLC - VA 138E MANASSAS VA
2017-05-05 571-448-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F ENGLESIDE VA
2017-04-27 571-459-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN19 VA
2017-04-18 571-639-2XXX 2000–2999Assigned TELNYX LLC 073H ARCOLA VA
2017-04-13 571-352-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2017-04-11 571-369-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2017-04-11 571-369-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2017-03-30 571-459-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN19 VA
2017-03-30 571-459-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN19 VA
2017-03-21 571-459-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 WSNGTNZN19 VA
2017-03-21 571-799-9XXX 9000–9999Assigned ONVOY, LLC - VA 138E LEESBURG VA
2017-03-15 571-660-1XXX 1000–1999Assigned ONVOY, LLC - VA 138E TRIANGLE VA
2017-03-14 571-477-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 OCCOQUAN VA
2017-03-14 571-799-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LEESBURG VA
2017-03-13 571-427-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J OCCOQUAN VA
2017-03-09 571-260-5XXX 5000–5999Assigned ONVOY, LLC - VA 138E DALE CITY VA
2017-03-09 571-348-6XXX 6000–6999Assigned ONVOY, LLC - VA 138E LORTON VA
2017-03-09 571-399-3XXX 3000–3999Assigned ONVOY, LLC - VA 138E INDENDNTHL VA
2017-03-09 571-486-5XXX 5000–5999Assigned ONVOY, LLC - VA 138E HAYMARKET VA
2017-03-09 571-655-0XXX 0000–0999Assigned TELNYX LLC 073H BRADDOCK VA
2017-03-09 571-781-5XXX 5000–5999Assigned ONVOY, LLC - VA 138E NOKESVILLE VA
2017-03-09 571-932-5XXX 5000–5999Assigned ONVOY, LLC - VA 138E LORTONMTRO VA
2017-03-07 571-599-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2017-03-03 571-371-0XXX 0000–0999Assigned TELNYX LLC 073H WSNGTNZN08 VA
2017-03-03 571-427-7XXX 7000–7999Assigned TELNYX LLC 073H OCCOQUAN VA
2017-02-21 571-642-7XXX 7000–7999Assigned METROPCS, INC. 5562 ENGLESIDE VA
2017-02-21 571-799-6XXX 6000–6999Assigned METROPCS, INC. 5562 LEESBURG VA
2017-01-20 571-459-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN19 VA
2017-01-17 571-260-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DALE CITY VA
2017-01-17 571-320-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TRIANGLE VA
2017-01-17 571-639-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ARCOLA VA
2017-01-06 571-320-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 TRIANGLE 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.