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
2004-03-04 443-747-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PT DEPOSIT MD
2004-03-04 443-767-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WORTHINGTN MD
2004-03-04 443-918-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 TANEYTOWN MD
2004-03-04 443-937-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 UNION BDG MD
2004-03-01 443-205-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 CAMBRIDGE MD
2004-03-01 443-216-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DUNDALK MD
2004-03-01 443-276-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 COLUMBIA MD
2004-03-01 443-292-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CROFTON MD
2004-03-01 443-297-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ARBUTUS MD
2004-03-01 443-341-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CATONSVL MD
2004-03-01 443-412-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHURCHVL MD
2004-03-01 443-419-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GLENWOOD MD
2004-03-01 443-504-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FALLSTON MD
2004-03-01 443-507-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAMPSTEAD MD
2004-03-01 443-671-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NEWWINDSOR MD
2004-03-01 443-703-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BALTIMORE MD
2004-03-01 443-834-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2004-03-01 443-848-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2004-03-01 443-880-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2004-02-27 443-341-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J CATONSVL MD
2004-02-18 443-225-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CAMBRIDGE MD
2004-02-17 443-419-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J GLENWOOD MD
2004-02-10 443-564-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2004-02-10 443-564-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2004-02-10 443-564-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2004-02-10 443-564-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2004-02-10 443-564-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2004-02-10 443-564-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2004-02-10 443-564-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2004-02-10 443-567-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BEL AIR MD
2004-02-10 443-567-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BEL AIR MD
2004-02-10 443-567-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BEL AIR MD
2004-02-10 443-567-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BEL AIR MD
2004-02-10 443-567-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BEL AIR MD
2004-02-10 443-567-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BEL AIR MD
2004-02-10 443-798-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2004-02-10 443-798-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2004-02-10 443-798-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2004-02-03 443-244-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WESTMINSTR MD
2004-02-03 443-262-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 CENTREVL MD
2004-02-03 443-472-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2004-02-03 443-504-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2004-02-03 443-534-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2004-02-03 443-534-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2004-02-03 443-848-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2004-02-02 443-880-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2004-01-28 443-625-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 FORK MD
2004-01-21 443-239-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 EASTON MD
2004-01-21 443-297-5XXX 5000–5999Assigned VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 4492 ARBUTUS MD
2004-01-21 443-341-2XXX 2000–2999Assigned VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 4492 CATONSVL 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.