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
2004-09-17 443-212-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J SPARKSGLNC MD
2004-09-16 443-566-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 CHESAPKECY MD
2004-09-13 443-641-2XXX 2000–2999Assigned VERIZON MARYLAND, INC. 9212 PIKESVILLE MD
2004-09-13 443-641-5XXX 5000–5999Assigned VERIZON MARYLAND, INC. 9212 PIKESVILLE MD
2004-09-13 443-975-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PRINCEFRCK MD
2004-09-08 443-307-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BEL AIR MD
2004-09-08 443-307-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BEL AIR MD
2004-09-08 443-867-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2004-09-08 443-891-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2004-09-08 443-904-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-09-08 443-904-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-09-07 443-285-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2004-09-07 443-285-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2004-09-07 443-504-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2004-08-30 443-789-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WESTMINSTR MD
2004-08-30 443-789-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WESTMINSTR MD
2004-08-27 443-508-4XXX 4000–4999Assigned VERIZON MARYLAND, INC. 9212 HAMPSTEAD MD
2004-08-24 443-992-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2004-08-19 443-378-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BALTIMORE MD
2004-08-19 443-378-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BALTIMORE MD
2004-08-19 443-378-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BALTIMORE MD
2004-08-13 443-459-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J ELKRIDGE MD
2004-08-11 443-330-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J COCKEYSVL MD
2004-08-11 443-457-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J BRYNPKLNCM MD
2004-08-05 443-285-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2004-08-05 443-366-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2004-08-05 443-523-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2004-08-05 443-797-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2004-08-05 443-797-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2004-07-14 443-939-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-07-08 443-244-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WESTMINSTR MD
2004-07-08 443-472-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2004-07-08 443-504-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2004-07-08 443-534-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2004-07-08 443-786-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON MD
2004-07-06 443-205-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CAMBRIDGE MD
2004-07-06 443-928-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-07-02 443-404-7XXX 7000–7999Assigned METROPCS, INC. 5562 SOLOMONS MD
2004-07-02 443-486-4XXX 4000–4999Assigned VERIZON MARYLAND, INC. 9212 PRINCEFRCK MD
2004-06-29 443-662-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 SPARKSGLNC MD
2004-06-04 443-504-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2004-06-04 443-523-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2004-06-04 443-523-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2004-06-04 443-523-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2004-06-04 443-797-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2004-06-04 443-867-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2004-06-04 443-907-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ELKTON MD
2004-06-01 443-426-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J RANDALLSTN MD
2004-06-01 443-542-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J COLUMBIA MD
2004-06-01 443-795-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J SEVERN 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.