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 443
YMAX COMMUNICATIONS CORP. - MD 38
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
2011-06-07 443-897-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2011-06-07 443-930-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2011-03-10 443-888-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E PRINCEANNE MD
2011-03-07 443-437-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E POCOMOKE MD
2011-02-18 443-358-0XXX 0000–0999Assigned YMAX COMMUNICATIONS CORP. - MD 281E SALISBURY MD
2011-02-18 443-358-1XXX 1000–1999Assigned YMAX COMMUNICATIONS CORP. - MD 281E SALISBURY MD
2011-02-18 443-358-2XXX 2000–2999Assigned YMAX COMMUNICATIONS CORP. - MD 281E SALISBURY MD
2011-02-18 443-358-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. - MD 281E SALISBURY MD
2011-02-18 443-358-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. - MD 281E SALISBURY MD
2009-09-15 443-229-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - MD 281E SEVERNA PK MD
2009-09-15 443-229-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E SEVERNA PK MD
2009-09-15 443-288-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. - MD 281E ELLICOTTCY MD
2009-09-14 443-438-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2009-09-14 443-478-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2009-09-14 443-478-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2009-09-14 443-478-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2009-08-10 443-229-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. - MD 281E SEVERNA PK MD
2009-02-02 443-229-2XXX 2000–2999Assigned YMAX COMMUNICATIONS CORP. - MD 281E SEVERNA PK MD
2009-01-30 443-364-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - MD 281E ELLICOTTCY MD
2009-01-30 443-364-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E ELLICOTTCY MD
2009-01-05 443-329-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WATERLO236 MD
2008-06-27 443-636-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E CATONSVL MD
2008-06-27 443-636-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E CATONSVL MD
2008-06-27 443-951-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - MD 281E ANNAPOLIS MD
2008-06-27 443-951-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E ANNAPOLIS MD
2008-06-26 443-364-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. - MD 281E ELLICOTTCY MD
2007-07-24 443-636-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - MD 281E CATONSVL MD
2007-07-24 443-951-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E ANNAPOLIS MD
2007-06-01 443-982-0XXX 0000–0999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-1XXX 1000–1999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-2XXX 2000–2999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE 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.