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
2011-04-04 443-252-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PERRYVILLE MD
2011-04-04 443-282-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 CHESTERTN MD
2011-04-04 443-377-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2011-04-04 443-377-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2011-04-04 443-547-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WESTMINSTR MD
2011-04-04 443-619-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BEL AIR MD
2011-04-04 443-826-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2011-04-04 443-826-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2011-04-04 443-842-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2011-04-04 443-842-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2011-04-04 443-842-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2011-04-01 443-330-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 COCKEYSVL MD
2011-03-31 443-741-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 COLUMBIA MD
2011-03-23 443-736-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SALISBURY MD
2011-03-16 443-380-5XXX 5000–5999Assigned VERIZON MARYLAND, INC. 9212 WOODLAWN MD
2011-03-16 443-380-6XXX 6000–6999Assigned VERIZON MARYLAND, INC. 9212 WOODLAWN MD
2011-03-16 443-380-7XXX 7000–7999Assigned VERIZON MARYLAND, INC. 9212 WOODLAWN MD
2011-03-16 443-380-8XXX 8000–8999Assigned VERIZON MARYLAND, INC. 9212 WOODLAWN MD
2011-03-11 443-282-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CHESTERTN MD
2011-03-11 443-655-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BEL AIR MD
2011-03-11 443-655-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BEL AIR MD
2011-03-10 443-367-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 COLUMBIA MD
2011-03-10 443-393-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 COLUMBIA MD
2011-03-10 443-842-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2011-03-10 443-888-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E PRINCEANNE MD
2011-03-07 443-390-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CHURCHVL MD
2011-03-07 443-422-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GLENBURNIE MD
2011-03-07 443-437-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E POCOMOKE MD
2011-03-07 443-619-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BEL AIR MD
2011-03-07 443-619-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BEL AIR MD
2011-03-07 443-620-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WATERLO238 MD
2011-03-07 443-937-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F UNION BDG MD
2011-03-03 443-239-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 EASTON MD
2011-03-03 443-492-8XXX 8000–8999Assigned METROPCS, INC. 5562 ELKRIDGE MD
2011-03-03 443-561-5XXX 5000–5999Assigned METROPCS, INC. 5562 ELKRIDGE MD
2011-03-03 443-561-6XXX 6000–6999Assigned METROPCS, INC. 5562 ELKRIDGE MD
2011-03-03 443-561-7XXX 7000–7999Assigned METROPCS, INC. 5562 ELKRIDGE MD
2011-03-03 443-561-8XXX 8000–8999Assigned METROPCS, INC. 5562 ELKRIDGE MD
2011-03-03 443-757-2XXX 2000–2999Assigned METROPCS, INC. 5562 ELKRIDGE MD
2011-03-03 443-757-4XXX 4000–4999Assigned METROPCS, INC. 5562 ELKRIDGE MD
2011-03-03 443-826-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2011-03-03 443-826-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2011-02-28 443-875-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2011-02-28 443-875-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2011-02-28 443-924-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2011-02-28 443-924-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2011-02-28 443-949-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2011-02-28 443-949-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2011-02-23 443-377-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F TOWSON MD
2011-02-21 443-207-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 6626 ELKTON 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.