NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

17 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, 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
2004-06-01 443-928-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-05-24 443-392-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-05-20 443-262-4XXX 4000–4999Assigned VERIZON MARYLAND, INC. 9212 CENTREVL MD
2004-05-19 443-957-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2004-05-18 443-249-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 STEVENSVL MD
2004-05-17 443-874-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2004-05-17 443-874-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2004-05-17 443-874-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2004-05-17 443-874-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2004-05-17 443-874-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2004-05-17 443-874-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2004-05-17 443-874-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2004-05-12 443-392-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-05-07 443-205-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 CAMBRIDGE MD
2004-05-07 443-472-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2004-05-07 443-534-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2004-05-07 443-848-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2004-05-06 443-423-8XXX 8000–8999Assigned VERIZON MARYLAND, INC. 9212 BALTIMORE MD
2004-04-28 443-939-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-04-28 443-939-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-04-21 443-933-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 COCKEYSVL MD
2004-04-20 443-278-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2004-04-16 443-278-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-04-16 443-278-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-04-16 443-278-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-04-06 443-703-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BALTIMORE MD
2004-04-06 443-703-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BALTIMORE MD
2004-04-06 443-703-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BALTIMORE MD
2004-04-06 443-939-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-04-06 443-939-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-04-06 443-939-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-04-05 443-285-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2004-04-05 443-504-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2004-04-05 443-834-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2004-04-05 443-880-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2004-03-19 443-353-1XXX 1000–1999Assigned VERIZON MARYLAND, INC. 9212 COCKEYSVL MD
2004-03-19 443-353-2XXX 2000–2999Assigned VERIZON MARYLAND, INC. 9212 COCKEYSVL MD
2004-03-19 443-353-3XXX 3000–3999Assigned VERIZON MARYLAND, INC. 9212 COCKEYSVL MD
2004-03-10 443-224-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2004-03-10 443-224-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2004-03-10 443-625-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 FORK MD
2004-03-05 443-249-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 STEVENSVL MD
2004-03-04 443-206-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PERRYVILLE MD
2004-03-04 443-262-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CENTREVL MD
2004-03-04 443-272-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 RANDALLSTN MD
2004-03-04 443-290-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PARKVILLE MD
2004-03-04 443-295-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PRINCEFRCK MD
2004-03-04 443-334-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PIKESVILLE MD
2004-03-04 443-672-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PARKTON MD
2004-03-04 443-674-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NORTH EAST 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.