NumberResearch Membership · Data 09/23/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/23/2026

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, all time — NPA 571
YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 59
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
2010-10-08 571-210-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E ARCOLA VA
2010-10-08 571-210-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E ARCOLA VA
2010-09-14 571-933-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E DULLESMTRO VA
2010-05-26 571-933-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E DULLESMTRO VA
2009-08-17 571-207-0XXX 0000–0999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E LEESBURG VA
2009-08-17 571-207-1XXX 1000–1999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E LEESBURG VA
2009-08-17 571-207-2XXX 2000–2999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E LEESBURG VA
2009-08-17 571-207-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E LEESBURG VA
2009-08-17 571-207-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E LEESBURG VA
2009-02-03 571-399-0XXX 0000–0999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E INDENDNTHL VA
2009-02-03 571-399-1XXX 1000–1999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E INDENDNTHL VA
2009-02-03 571-399-2XXX 2000–2999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E INDENDNTHL VA
2009-01-29 571-255-1XXX 1000–1999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN08 VA
2009-01-29 571-255-2XXX 2000–2999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN08 VA
2009-01-29 571-255-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN08 VA
2009-01-29 571-255-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN08 VA
2009-01-29 571-286-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN17 VA
2009-01-29 571-308-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN19 VA
2009-01-29 571-766-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN17 VA
2009-01-29 571-766-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN17 VA
2009-01-29 571-931-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E TRIANGLE VA
2009-01-29 571-931-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E TRIANGLE VA
2009-01-07 571-281-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E BRADDOCK VA
2009-01-07 571-281-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E BRADDOCK VA
2009-01-07 571-339-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E ENGLESIDE VA
2008-09-25 571-266-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E HERNDON VA
2008-09-25 571-266-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E HERNDON VA
2008-09-25 571-299-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E HERNDON VA
2008-09-25 571-529-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN19 VA
2008-09-25 571-529-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN19 VA
2008-09-25 571-529-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN19 VA
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
2008-05-15 571-765-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN17 VA
2008-05-15 571-765-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN17 VA
2008-04-24 571-374-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E INDENDNTHL VA
2008-04-24 571-374-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E INDENDNTHL VA
2008-03-07 571-374-2XXX 2000–2999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E INDENDNTHL VA
2008-02-29 571-933-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E DULLESMTRO VA
2008-02-29 571-934-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E DULLES VA
2008-02-29 571-934-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E DULLES VA
2007-05-23 571-480-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN08 VA
2007-05-23 571-480-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN08 VA
2007-05-23 571-481-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN08 VA
2007-05-23 571-481-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN08 VA
2007-05-23 571-483-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E WSNGTNZN08 VA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.