NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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 301
YMAX COMMUNICATIONS CORP. - MD 47
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
2013-11-14 301-812-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSNG238Z15 MD
2011-08-23 301-569-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E GAITHERSBG MD
2011-08-23 301-740-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - MD 281E GAITHERSBG MD
2011-06-07 301-494-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSNG238Z15 MD
2011-06-07 301-494-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSNG238Z15 MD
2011-03-03 301-956-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E GAITHERSBG MD
2011-03-03 301-956-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E GAITHERSBG MD
2011-03-01 301-494-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSNG238Z15 MD
2011-01-21 301-355-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E GAITHERSBG MD
2010-09-22 301-812-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSNG238Z15 MD
2010-08-23 301-836-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN5 MD
2010-08-23 301-836-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN5 MD
2010-08-20 301-892-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN4 MD
2010-08-20 301-892-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN4 MD
2010-08-20 301-968-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN2 MD
2010-05-27 301-202-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN2 MD
2010-05-27 301-202-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN2 MD
2010-01-05 301-202-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN2 MD
2010-01-05 301-202-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN2 MD
2010-01-05 301-202-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN2 MD
2009-09-15 301-375-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - MD 281E INDIANHEAD MD
2009-09-15 301-684-1XXX 1000–1999Assigned YMAX COMMUNICATIONS CORP. - MD 281E INDIANHEAD MD
2009-09-15 301-684-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. - MD 281E INDIANHEAD MD
2009-09-15 301-684-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E INDIANHEAD MD
2009-03-04 301-533-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E OAKLAND MD
2008-09-24 301-328-2XXX 2000–2999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN3 MD
2008-09-24 301-328-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN3 MD
2008-09-24 301-328-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN3 MD
2008-09-24 301-328-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN3 MD
2008-09-24 301-433-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN5 MD
2008-09-24 301-458-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN4 MD
2008-09-24 301-618-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN4 MD
2008-09-24 301-778-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN5 MD
2008-09-02 301-327-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSNG238Z15 MD
2008-09-02 301-327-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSNG238Z15 MD
2008-02-14 301-327-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSNG238Z15 MD
2007-07-24 301-327-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSNG238Z15 MD
2006-11-21 301-534-0XXX 0000–0999Assigned YMAX COMMUNICATIONS CORP. - MD 281E INDIANHEAD MD
2006-11-21 301-534-1XXX 1000–1999Assigned YMAX COMMUNICATIONS CORP. - MD 281E INDIANHEAD MD
2006-11-21 301-534-2XXX 2000–2999Assigned YMAX COMMUNICATIONS CORP. - MD 281E INDIANHEAD MD
2006-11-21 301-534-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. - MD 281E INDIANHEAD MD
2006-11-21 301-534-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. - MD 281E INDIANHEAD MD
2006-11-21 301-534-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - MD 281E INDIANHEAD MD
2006-11-21 301-534-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - MD 281E INDIANHEAD MD
2006-11-21 301-534-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E INDIANHEAD MD
2006-11-21 301-534-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E INDIANHEAD MD
2006-11-21 301-534-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E INDIANHEAD MD

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.