NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

17 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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 443
ONVOY, LLC - MD 8
NEW CINGULAR WIRELESS PCS, LLC - DC 4
VERSATEL LLC 1
OPENTACT INC. 1
LEVEL 3 COMMUNICATIONS, LLC - MD 1
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
2011-02-21 443-535-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F COLUMBIA MD
2011-02-21 443-792-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BRYNPKLNCM MD
2011-02-21 443-973-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ELLICOTTCY 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
2011-02-17 443-971-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F TANEYTOWN MD
2011-02-15 443-537-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J COLUMBIA MD
2011-02-15 443-800-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2011-02-10 443-252-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F PERRYVILLE MD
2011-02-10 443-267-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F DARLINGTON MD
2011-02-09 443-990-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2011-02-09 443-990-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2011-02-04 443-435-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-04 443-435-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-04 443-435-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-04 443-435-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-04 443-435-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-04 443-435-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-04 443-435-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-04 443-435-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-04 443-435-8XXX 8000–8999Assigned METROPCS, INC. 5562 BALTIMORE MD
2011-02-04 443-435-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-02 443-619-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BEL AIR MD
2011-02-01 443-208-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-208-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-208-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-208-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-208-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-208-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-208-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-208-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-208-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-208-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-314-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-314-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-314-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-314-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-314-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-314-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-314-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-314-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-314-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-314-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-800-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-800-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-800-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-02-01 443-800-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.