NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

17 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 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
2005-01-05 443-632-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2005-01-05 443-867-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2005-01-04 443-219-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 PARKVILLE MD
2005-01-04 443-366-6XXX 6000–6999Assigned METROPCS, INC. 5562 SALISBURY MD
2005-01-04 443-536-2XXX 2000–2999Assigned METROPCS, INC. 5562 WESTMINSTR MD
2005-01-04 443-694-2XXX 2000–2999Assigned METROPCS, INC. 5562 SEVERNA PK MD
2004-12-29 443-423-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-12-29 443-423-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-12-29 443-423-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-12-29 443-867-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2004-12-28 443-541-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 COCKEYSVL MD
2004-12-28 443-637-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ARGRGBSNIS MD
2004-12-16 443-341-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CATONSVL MD
2004-12-16 443-519-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2004-12-10 443-701-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ARBUTUS MD
2004-12-10 443-701-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ARBUTUS MD
2004-12-06 443-299-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2004-12-06 443-299-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2004-12-06 443-299-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2004-12-06 443-472-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2004-12-06 443-472-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2004-12-06 443-577-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J GLENBURNIE MD
2004-12-06 443-786-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON MD
2004-12-06 443-867-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2004-12-03 443-516-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J SYKESVILLE MD
2004-12-01 443-569-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ANNAPOLIS MD
2004-11-30 443-508-1XXX 1000–1999Assigned METROPCS, INC. 5562 HAMPSTEAD MD
2004-11-29 443-298-1XXX 1000–1999Assigned METROPCS, INC. 5562 EASTON MD
2004-11-24 443-542-4XXX 4000–4999Assigned VERIZON MARYLAND, INC. 9212 COLUMBIA MD
2004-11-24 443-542-6XXX 6000–6999Assigned VERIZON MARYLAND, INC. 9212 COLUMBIA MD
2004-11-10 443-303-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ABERDEEN MD
2004-11-04 443-224-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-11-04 443-278-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-11-04 443-320-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-11-02 443-834-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2004-11-02 443-867-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2004-10-27 443-542-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 COLUMBIA MD
2004-10-27 443-927-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-10-27 443-927-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-10-21 443-784-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 ARGRGBSNIS MD
2004-10-12 443-244-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WESTMINSTR MD
2004-10-08 443-299-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2004-10-08 443-472-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2004-10-06 443-366-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 SALISBURY MD
2004-10-06 443-366-8XXX 8000–8999Assigned METROPCS, INC. 5562 SALISBURY MD
2004-10-06 443-373-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 OCEAN CITY MD
2004-10-05 443-282-6XXX 6000–6999Assigned METROPCS, INC. 5562 CHESTERTN MD
2004-10-05 443-282-7XXX 7000–7999Assigned METROPCS, INC. 5562 CHESTERTN MD
2004-09-28 443-373-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 OCEAN CITY MD
2004-09-21 443-550-6XXX 6000–6999Assigned VERIZON MARYLAND, INC. 9212 NORTHBEACH 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.