NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

2 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 410
ONVOY, LLC - MD 2
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
2008-09-02 410-660-1XXX 1000–1999Assigned METROPCS, INC. 5562 ELKRIDGE MD
2008-08-27 410-927-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ODENTON MD
2008-08-27 410-942-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 HAVREGRACE MD
2008-08-11 410-457-8XXX 8000–8999Assigned ARMSTRONG TELECOMMUNICATIONS, INC. - MD 420C DARLINGTON MD
2008-08-11 410-692-4XXX 4000–4999Assigned ARMSTRONG TELECOMMUNICATIONS, INC. - MD 420C JARRETTSVL MD
2008-08-11 410-734-8XXX 8000–8999Assigned ARMSTRONG TELECOMMUNICATIONS, INC. - MD 420C CHURCHVL MD
2008-07-21 410-497-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 PARKVILLE MD
2008-07-03 410-205-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PIKESVILLE MD
2008-06-26 410-988-0XXX 0000–0999Assigned YMAX COMMUNICATIONS CORP. - MD 281E ELLICOTTCY MD
2008-06-26 410-988-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E ELLICOTTCY MD
2008-06-17 410-865-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2008-06-02 410-441-8XXX 8000–8999Assigned ARMSTRONG TELECOMMUNICATIONS, INC. - MD 420C ELKTON MD
2008-05-30 410-364-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J HILLSBORO MD
2008-05-30 410-656-0XXX 0000–0999Assigned ARMSTRONG TELECOMMUNICATIONS, INC. - MD 420C NORTH EAST MD
2008-05-19 410-689-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2008-05-14 410-929-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2008-05-06 410-394-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SOLOMONS MD
2008-05-06 410-696-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ELLICOTTCY MD
2008-05-05 410-575-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 FORK MD
2008-04-28 410-317-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ARGRGBSNIS MD
2008-04-28 410-412-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GLENBURNIE MD
2008-04-28 410-595-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GLENBURNIE MD
2008-04-28 410-705-1XXX 1000–1999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WATERLO236 MD
2008-04-28 410-705-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WATERLO236 MD
2008-04-18 410-317-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ARGRGBSNIS MD
2008-04-18 410-424-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GLENBURNIE MD
2008-04-16 410-881-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SHERWD FOR MD
2008-04-14 410-849-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SHERWD FOR MD
2008-04-01 410-781-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E ELLICOTTCY MD
2008-04-01 410-946-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E SEVERNA PK MD
2008-03-31 410-891-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J COCKEYSVL MD
2008-03-24 410-589-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BRYNPKLNCM MD
2008-03-24 410-928-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 MILLINGTON MD
2008-03-20 410-469-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2008-03-03 410-344-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CHASE MD
2008-03-03 410-374-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J HAMPSTEAD MD
2008-02-11 410-841-4XXX 4000–4999Assigned METROPCS, INC. 5562 SEVERNA PK MD
2008-02-07 410-501-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J ARBUTUS MD
2008-02-05 410-384-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SEVERNA PK MD
2008-02-05 410-443-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON MD
2008-02-05 410-443-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON MD
2008-02-01 410-696-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ELLICOTTCY MD
2008-02-01 410-994-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 EDGEWOOD MD
2008-02-01 410-994-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 EDGEWOOD MD
2008-01-25 410-946-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SEVERNA PK MD
2008-01-22 410-660-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ELKRIDGE MD
2008-01-17 410-417-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 EDGEWOOD MD
2007-11-30 410-975-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J SEVERNA PK MD
2007-11-20 410-305-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J ODENTON MD
2007-11-20 410-513-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J PARKVILLE MD

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.