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
2003-10-22 443-550-4XXX 4000–4999Assigned QUANTUM TELECOMMUNICATIONS, INC. - MD 2596 NORTHBEACH MD
2003-10-17 443-244-8XXX 8000–8999Assigned VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 4492 WESTMINSTR MD
2003-10-17 443-276-3XXX 3000–3999Assigned VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 4492 COLUMBIA MD
2003-10-14 443-204-8XXX 8000–8999Assigned VERIZON MARYLAND, INC. 9212 PIKESVILLE MD
2003-10-13 443-807-2XXX 2000–2999Assigned METROPCS, INC. 5562 FALLSTON MD
2003-10-13 443-864-3XXX 3000–3999Assigned METROPCS, INC. 5562 COLUMBIA MD
2003-10-13 443-891-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2003-10-07 443-465-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2003-10-07 443-465-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2003-10-07 443-465-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2003-10-07 443-465-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2003-10-07 443-465-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2003-10-03 443-278-9XXX 9000–9999Assigned VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 4492 BALTIMORE MD
2003-10-03 443-386-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2003-10-03 443-417-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2003-10-03 443-417-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2003-10-03 443-472-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2003-10-03 443-848-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2003-10-03 443-880-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2003-09-26 443-334-2XXX 2000–2999Assigned VERIZON MARYLAND, INC. 9212 PIKESVILLE MD
2003-09-26 443-334-3XXX 3000–3999Assigned VERIZON MARYLAND, INC. 9212 PIKESVILLE MD
2003-09-26 443-352-4XXX 4000–4999Assigned VERIZON MARYLAND, INC. 9212 PIKESVILLE MD
2003-09-26 443-352-5XXX 5000–5999Assigned VERIZON MARYLAND, INC. 9212 PIKESVILLE MD
2003-09-18 443-392-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2003-09-18 443-392-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2003-09-18 443-392-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2003-09-18 443-392-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2003-09-18 443-392-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2003-09-18 443-392-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2003-09-11 443-507-0XXX 0000–0999Assigned VERIZON MARYLAND, INC. 9212 HAMPSTEAD MD
2003-09-05 443-812-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2003-09-04 443-610-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2003-09-04 443-610-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2003-08-29 443-872-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2003-08-29 443-872-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2003-08-29 443-872-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2003-08-29 443-872-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2003-08-25 443-791-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2003-08-21 443-791-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2003-08-21 443-791-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2003-08-21 443-791-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2003-08-13 443-213-2XXX 2000–2999Assigned VERIZON MARYLAND, INC. 9212 PIKESVILLE MD
2003-08-13 443-213-3XXX 3000–3999Assigned VERIZON MARYLAND, INC. 9212 PIKESVILLE MD
2003-08-13 443-213-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 PIKESVILLE MD
2003-08-12 443-423-4XXX 4000–4999Assigned VERIZON MARYLAND, INC. 9212 BALTIMORE MD
2003-08-12 443-423-5XXX 5000–5999Assigned VERIZON MARYLAND, INC. 9212 BALTIMORE MD
2003-08-12 443-423-6XXX 6000–6999Assigned VERIZON MARYLAND, INC. 9212 BALTIMORE MD
2003-08-12 443-423-7XXX 7000–7999Assigned VERIZON MARYLAND, INC. 9212 BALTIMORE MD
2003-08-06 443-417-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2003-08-06 443-610-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE 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.