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
2006-06-20 443-434-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J FEDERALSBG MD
2006-06-20 443-437-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J POCOMOKE MD
2006-06-20 443-448-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J DENTON MD
2006-06-20 443-513-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J BERLIN MD
2006-06-20 443-664-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J OCEAN CITY MD
2006-06-20 443-665-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J NANTICOKE MD
2006-06-19 443-766-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J COLUMBIA MD
2006-06-19 443-869-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-06-16 443-988-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CENTREVL MD
2006-06-14 443-839-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2006-06-14 443-839-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2006-06-14 443-944-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J SALISBURY MD
2006-06-07 443-455-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2006-06-07 443-455-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2006-06-07 443-455-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2006-06-02 443-388-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-06-02 443-388-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-06-02 443-388-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-06-02 443-523-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2006-06-02 443-758-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2006-06-02 443-758-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2006-06-02 443-758-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2006-06-02 443-758-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2006-06-02 443-758-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2006-06-02 443-758-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2006-06-02 443-955-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-06-02 443-955-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-06-02 443-974-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WESTMINSTR MD
2006-06-02 443-974-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WESTMINSTR MD
2006-06-02 443-989-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2006-06-01 443-595-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J SPARKSGLNC MD
2006-05-31 443-216-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 DUNDALK MD
2006-05-31 443-280-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SYKESVILLE MD
2006-05-31 443-282-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CHESTERTN MD
2006-05-31 443-445-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ELKRIDGE MD
2006-05-31 443-955-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2006-05-31 443-955-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2006-05-22 443-231-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J ESSEX MD
2006-05-22 443-231-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J ESSEX MD
2006-05-22 443-536-8XXX 8000–8999Assigned METROPCS, INC. 5562 WESTMINSTR MD
2006-05-12 443-439-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TRAPPE MD
2006-05-12 443-791-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2006-05-12 443-955-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-05-12 443-955-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-05-12 443-955-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-05-11 443-839-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2006-05-11 443-839-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2006-05-11 443-839-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2006-05-08 443-545-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J COLUMBIA MD
2006-05-08 443-660-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J PIKESVILLE 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.