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
2007-11-08 410-846-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SEVERN MD
2007-11-06 410-600-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BERLIN MD
2007-10-24 410-595-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J GLENBURNIE MD
2007-10-17 410-689-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2007-10-04 410-582-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J GLENBURNIE MD
2007-09-24 410-705-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WATERLO236 MD
2007-09-21 410-565-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 ARBUTUS MD
2007-09-10 410-317-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J ARGRGBSNIS MD
2007-09-10 410-589-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J BRYNPKLNCM MD
2007-08-22 410-417-0XXX 0000–0999Assigned VERIZON MARYLAND, INC. 9212 EDGEWOOD MD
2007-08-22 410-417-1XXX 1000–1999Assigned VERIZON MARYLAND, INC. 9212 EDGEWOOD MD
2007-08-22 410-417-2XXX 2000–2999Assigned VERIZON MARYLAND, INC. 9212 EDGEWOOD MD
2007-08-22 410-417-3XXX 3000–3999Assigned VERIZON MARYLAND, INC. 9212 EDGEWOOD MD
2007-08-22 410-417-4XXX 4000–4999Assigned VERIZON MARYLAND, INC. 9212 EDGEWOOD MD
2007-08-14 410-412-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2007-08-10 410-725-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 EASTON MD
2007-08-10 410-725-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 EASTON MD
2007-08-10 410-725-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 EASTON MD
2007-08-02 410-443-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON MD
2007-08-02 410-689-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2007-08-01 410-645-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J WOODLAWN MD
2007-07-27 410-497-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J PARKVILLE MD
2007-07-24 410-720-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E ELLICOTTCY MD
2007-07-24 410-946-2XXX 2000–2999Assigned YMAX COMMUNICATIONS CORP. - MD 281E SEVERNA PK MD
2007-07-18 410-720-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J ELLICOTTCY MD
2007-07-17 410-231-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J SOLOMONS MD
2007-07-17 410-305-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J ODENTON MD
2007-07-17 410-691-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GLENBURNIE MD
2007-07-10 410-231-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 SOLOMONS MD
2007-07-03 410-200-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON MD
2007-07-03 410-487-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2007-07-02 410-514-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J SEVERN MD
2007-06-29 410-705-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WATERLO236 MD
2007-06-26 410-564-4XXX 4000–4999Assigned METROPCS, INC. 5562 ELKRIDGE MD
2007-06-26 410-564-6XXX 6000–6999Assigned METROPCS, INC. 5562 ELKRIDGE MD
2007-06-26 410-564-7XXX 7000–7999Assigned METROPCS, INC. 5562 ELKRIDGE MD
2007-06-26 410-564-8XXX 8000–8999Assigned METROPCS, INC. 5562 ELKRIDGE MD
2007-06-19 410-701-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J RANDALLSTN MD
2007-06-07 410-846-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SEVERN MD
2007-06-04 410-202-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2007-06-04 410-487-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2007-05-02 410-200-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON MD
2007-05-02 410-794-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2007-04-30 410-504-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PIKESVILLE MD
2007-04-20 410-487-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J GLENBURNIE MD
2007-04-04 410-200-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON MD
2007-04-04 410-487-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2007-03-26 410-412-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2007-03-21 410-497-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PARKVILLE MD
2007-03-06 410-200-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON 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.