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
2008-08-18 571-377-0XXX 0000–0999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E MANASSAS VA
2008-08-18 571-377-1XXX 1000–1999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E MANASSAS VA
2008-08-18 571-377-2XXX 2000–2999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E MANASSAS VA
2008-08-18 571-377-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E MANASSAS VA
2008-08-18 571-377-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E MANASSAS VA
2008-08-18 571-377-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E MANASSAS VA
2008-08-14 571-281-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F BRADDOCK VA
2008-08-14 571-337-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2008-08-14 571-337-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2008-08-14 571-403-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN08 VA
2008-08-14 571-405-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2008-08-06 571-266-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 HERNDON VA
2008-08-06 571-439-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 LEESBURG VA
2008-08-06 571-439-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 LEESBURG VA
2008-07-31 571-384-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2008-07-31 571-405-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN17 VA
2008-07-31 571-439-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LEESBURG VA
2008-07-31 571-529-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN19 VA
2008-07-24 571-439-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LEESBURG VA
2008-07-24 571-439-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LEESBURG VA
2008-07-18 571-303-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN08 VA
2008-07-10 571-408-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J OCCOQUAN VA
2008-07-08 571-408-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 OCCOQUAN VA
2008-07-08 571-439-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 LEESBURG VA
2008-07-07 571-287-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2008-07-07 571-287-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HERNDON VA
2008-07-03 571-291-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J LEESBURG VA
2008-07-03 571-292-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2008-07-03 571-292-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2008-07-03 571-292-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2008-07-03 571-379-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2008-06-27 571-287-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2008-06-25 571-295-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN19 VA
2008-06-19 571-337-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2008-06-19 571-337-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2008-06-19 571-337-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2008-06-17 571-315-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2008-06-17 571-315-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2008-06-13 571-340-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN19 VA
2008-06-13 571-340-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN19 VA
2008-06-13 571-340-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN19 VA
2008-06-13 571-340-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN19 VA
2008-06-13 571-340-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN19 VA
2008-06-13 571-529-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN19 VA
2008-06-13 571-529-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN19 VA
2008-06-13 571-529-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN19 VA
2008-06-13 571-529-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN19 VA
2008-06-10 571-405-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2008-06-10 571-405-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2008-06-09 571-405-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J 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.